Miscellaneous HP 48 Documentation Files

hpcalc.org - HP 48 Archive

Miscellaneous HP 48 Documentation Files

The first size listed is the downloaded file size and the second size listed is the size on the calculator.

There are 260 files totaling 101516KB in this category.

"Wicked" Directory (details)	48 ENG 5KB
Explains a bit about the operation of the hidden directory, and shows a roundabout way to get to it on an SX.
By Eric Toonen.	2017/08/13

10 Interviews from hp-network.com (details)	48 ENG FRA 133KB
Contains 10 interviews from the French website www.hp-network.com. Included are the interviews of Arnaud Schmidt, Bernard Parisse, Paul Courbis, Gerald Squelart, HPGandalf, HPTroll, Zoak, LuDo and SunHP. You can find new interviews on www.hp-network.com. Only the interview of Eric Rechlin is in English.
By Bebert.	2002/09/16

128 KB RAM Card PCB (details)	48 ENG 62KB
Design for a PCB for a 128 KB RAM card.
By Erik Adler.	2017/06/11

41CV Emulator Card (details)	48 ENG 5KB
Brief review of the HP 41CV Emulator Card that was sold for the 48SX.
By Joseph K. Horn.	2008/08/13

48G RAM Upgrades (details)	48 ENG 14KB
Contains several documents telling how to go to 128K, 256K, 768K, and even 4M on the HP 48G.
Author unknown.	1998/10/29

48G/S to 256K/288K (details)	48 ENG 42KB
Explains how to go to 256K on the HP 48G and 288K on the HP 48S.
By Thomas Otten.	1997/08/21

48GX Quick Start Guide in Greek (details)	48 1281KB
Greek-language 89-page PDF quick start guide for the 48GX.
By John Kosmidis.	2017/03/11

48GX User's Guide in Greek (details)	48 941KB
Greek-language 142-page PDF user guide for the 48GX.
By John Kosmidis.	2017/03/11

48SX First Impressions (details)	48 ENG 3KB
Some first impressions of the 48SX, from the perspective of a 28S user.
Author unknown.	2017/08/13

48SX Menus (details)	48 ENG 11KB
A list of all the menus in the 48SX, numbered for input to the MENU function.
By Jake Schwartz.	2017/07/02

48SX Owner's Manuals Index (details)	48 ENG 43KB
Index to the most important topics of the 48SX Owner's Manuals.
By Jake Schwartz.	1998/01/23

48SX vs 28S (details)	48 ENG 17KB
A list of all the improvements in the 48SX compared to the 28S.
By Jake Schwartz.	2017/07/02

48SX/GX Keyguides (details)	48 ENG 11KB
Handy two-page tables listing the functions of all the keys on both the S series and G series. In Microsoft Word format.
By Sterling Babcock.	2017/07/02

AC/DC Adapter 1.0 (details)	48 ENG 186KB
Instructions telling how to make a power circuit to run the HP 48 on an AC adapter.
By Mauricio Sánchez Cruz.	2002/02/10

An HP-48 RAM Card 1.0 (details)	48 ENG 2113KB
Contains the schematics and Gerber files needed to create a 128 KB RAM card for the 48SX/GX calculators. Data sheets for the parts used are also included. The Bill of Material calls out specific vendor and vendor part numbers for the passive components used, but any equivalent part in the SMD 0805 package can be substituted. Battery backup is by use of a 12 mm lithium coin cell, either the CR1216 or the CR1225. The CR1225 has the higher capacity rating of the two at 48 mAh. Although that's only half the capacity of a CR2016, the Cypress MoBL SRAM memory device only requires 1 uA in standby mode when the memory is not selected so battery life should be reasonably long.
By Mark A. Fleming.	2019/07/20

Authors (details)	48 ENG 459KB
PostScript list of HP Journal article authors.
Author unknown.	1998/08/23

Bad Card Data (details)	48 ENG 1KB
A little tip on what to do if you get a "Bad Card Data" error message.
By Stephen J. Thomas.	1997/08/21

Bad Screens (details)	48 ENG 1KB
If you are having trouble with the screen in your HP 48, you may be eligible for a free replacement.
Author unknown.	1997/08/21

Bank Switching (details)	48 ENG 5KB
Commentary on automatic bank switching (48GX cards) versus manual bank switching (TDS cards for the 48SX).
By Joseph K. Horn.	2008/08/12

Battery Drain Information (details)	48 ENG 4KB
Lists some things that use up more battery power. This information is provided to help you conserve battery life.
By John H Meyers.	1998/01/10

Battery Drain Table (details)	48 ENG 6KB
Shows how much power different operations on the HP 48 take.
By Doug Cannon.	1997/08/30

Battery Drain Table #2 (details)	48 28 ENG 2KB
Compares battery usage of the HP 48 and HP 28.
By Simone Rapisarda.	1997/08/21

Battery Information (details)	48 ENG 1KB
Explains why it is best not to use rechargeable batteries in the HP 48.
Author unknown.	1997/09/06

Battery Leak Keyboard Repair (details)	48 ENG 338KB
Description and photos of how one person repaired a keyboard failure in a 48GX due to the batteries leaking.
By Vito Presicci.	2008/08/09

Beep Frequencies (details)	48 ENG 18KB
An analysis of the way the 48SX produces beeps, and side effects that can be noticed due to the implementation.
By Eric T. Lane and Joe Ervin.	2017/07/02

Bestfit Bug (details)	48 ENG 2KB
Details on the BESTFIT bug on GX revisions M-P.
By Boris Ivanovic.	1998/01/10

Broken Reset Button (details)	48 ENG 2KB
If your reset button breaks, this is how to reset your calculator.
By Dave Arnett.	1999/01/06

Buglist (details)	48 ENG 9KB
Discussion of early bug reports about the HP 48SX and the fixes for the actual bugs.
By William C Wickes.	2008/08/12

Cable Connector Info (details)	48 ENG 3KB
Gives specific information about the connector from the HP 48 Serial Interface Kit.
By Mark Adler.	1998/02/28

CalcCompare2003 1.1 (details)	48 ENG DEU 276KB
Included are two PDF tables (English and German) with an equipment comparison between the HP 49G and some comparable 2003 graphic calculators from Casio (CFX-9850GB+, Algebra FX 2.0+, ClassPad 300), Sharp (EL-9650, EL-9900, PC-E500S) and TI (89, Voyage 200).
By Dirk Duetemeyer.	2003/05/08

Calculator Command Comparison Sheet 2.00 (details)	49/50 48 28 ENG 279KB
A command comparison sheet of HP symbolic RPN calculators, containing a description of every command. Covers the HP 28C, 28S, 48S/SX, 48G/G+/GX, and 49G/48gII/49g+. The sheet is color coded based on the model for easy reading. In Excel format but also compatible with OpenOffice and Pocket Excel.
By Veli-Pekka Nousiainen.	2005/05/24

Calculator Comparison 5 (details)	49/50 48 28 ENG 5KB
Compares the HP 49 with the 48GX, 48G+, 48G, 48SX, 48S, 28S, and 28C.
By Veli-Pekka Nousiainen.	2000/09/21

Calculator Enhanced Instruction Project (details)	48 ENG 2392KB
A 123-page document discussing using graphing calculators (specifically the HP 48S and TI-81) in education of precalculus and calculus topics. In PDF format.
By Jean Lane and others.	2020/12/30

Card Pins (details)	48 ENG 3KB
Pinouts of the HP 48SX and GX card slots.
By Joel Kolstad.	1999/01/06

Cartão de Memória (details)	48 POR 207KB
Diagrams for constructing a 128 KB memory card.
By Eduardo Artur Cunha.	2017/07/29

Clock Jitter (details)	48 ENG 1KB
Information on noise in the HP 48 quartz timing crystal.
By Dave Arnett.	1999/01/06

CMT Memory Card Information (details)	48 ENG 8KB
Information about using CMT-brand RAM cards in the HP 48.
By Stephen J. Thomas.	1997/09/06

Como fazer o cabo 1.0 (details)	48 POR 6KB
With this document you will build and improve your HP 48-PC cable. The HP-PC cable allows you to get programs from your computer and transmit to your HP.
By Marcos Peres.	2001/05/18

comp.sources.hp48 Posting Information (details)	48 ENG 17KB
A little out of date now and only here for historical reasons, but it contains posting information for comp.sources.hp48 along with source code for SHIP.
Author unknown.	1998/01/12

Compiling a String (details)	48 ENG 3KB
Explains several methods of compiling a string into an object, and lists advantages and disadvantages of each.
By John H Meyers.	1998/08/29

Complete List of HP 48G Series Messages (details)	48 ENG ESP 11KB
HP 48G messages listed numerically. All messages are listed. ASCII Document.
By Jordi Hidalgo.	2000/09/13

Complex Numbers Marathon 1.5 (details)	49/50 48 ENG 971KB
Detailed documentation of the algebraic and graphics capabilities of the HP 49G working with complex quantities. New orthographically corrected version. The ZIP archive includes all programs of the marathon.
By Nick Karagiaouroglou.	2003/06/30

Complex Units (details)	48 ENG 2KB
Questions and answers about imaginary units.
By William C Wickes.	2008/08/17

Connect HP48 via IR (details)	48 ENG 6KB
This document explains how to connect your HP 48 series to your computer through an IR device (originally written for an HP notebook).
By Bora.	2002/01/21

Converting Vectors To Array (details)	48 ENG 3KB
Gives several examples of how to convert two vectors to an array.
By Jan Brittenson, Scott Burke, Ruben Rostamian and others.	2008/08/12

Copying Protected Libraries (details)	48 ENG 4KB
Shows how to use a SYSEVAL to extract libraries from read-only cards, which otherwise cannot be recalled with the RCL command.
Author unknown.	2017/07/02

CRC Information (details)	48 ENG 3KB
Contains information about how the checksums for objects are determined and gives two C routines to calculate them.
By Alonzo Gariepy and Dave Kaffine.	1998/06/09

Creating Built-In Functions (details)	48 ENG 1KB
Given x and F on the stack, where x is any argument, and F is a function of one argument (user-defined or built-in), this shows how to get 'F(x)'
By William C Wickes.	2008/08/12

Cute HP 48 Bug (details)	48 ENG 1KB
Comments about a bug in the 48 that lets you enter system binaries from the command line.
By John Paul Morrison.	2008/08/13

Dave's ROM Dump Copying Comments (details)	48 ENG 5KB
Comments on the moral issues of copying ROM dumps.
By Dave Arnett.	1999/01/06

Digital Oscilloscope (details)	48 ENG 29KB
PostScript file of documentation for a digital scope using an HP 48 and a Motorola HC11 microprocessor kit.
By Bill Madden.	1997/08/21

Do It Yourself RAM Card (details)	48 ENG 989KB
Schematics for building a RAM card in Adobe PDF format. Also includes photos and a screenshot of one possible PCB layout.
By Marcel Flipse.	1999/05/12

Editor Plus Notes 2.0 (details)	48 ENG 4KB
Explains how to use Editor Plus, exploring the configuration object PluS (in the hidden directory), plus how to remove PLUS from CST.
By Brian Kelley.	2017/05/14

EduCALC Product List (details)	48 ENG 11KB
Listing of EduCALC's HP 48 products and prices from late 1990 and early 1991. Interesting to see the 48SX sell for $275 and other high prices...
Author unknown.	1998/01/12

EduCALC Technical Notes (details)	48 ENG 93KB
Fourteen documents about the HP 48 involving programming and other topics by EduCALC.
Author unknown.	1997/10/15

Equation Library Card Review (details)	48 ENG 3KB
A brief overview of the Equation Library Card produced for the 48SX (and built-in to the 48G series).
By Dave Seaman.	2017/08/13

Errata for the 48SX Manual (details)	48 ENG 24KB
Lists all the mistakes and the corresponding corrections for the 48SX manual.
Author unknown.	2017/08/13

External Keyboard 1.1 (details)	48 ENG 690KB
Explains how to build an external keyboard for the HP 48.
By Nacho Vialta.	2003/12/27

External Power Jack (details)	48 ENG 8KB
Shows how to put an external power jack into the HP 48 for plugging in an AC adapter or any other external power supply. Great feature to add if you're upgrading the memory of your S or G!
By Carles Albert Vallvè Guionnet.	1997/10/25

External Power Jack (HTML) (details)	48 ENG 16KB
Shows how to put an external power jack into the HP 48 for plugging in an AC adapter or any other external power supply. This file is more comprehensive than the above file, and is in HTML format.
By Carles Albert Vallvè Guionnet.	1998/02/25

Flag -34 (details)	48 ENG 1KB
An important note about flag -34, where the manual is wrong.
By Tony Duell.	2008/08/16

Flag Listing (details)	48 ENG 4KB
Lists what flags are used by what programs for the HP 48.
By Joseph K. Horn.	1997/08/21

Full Path (details)	48 ENG 4KB
Discussion of how to execute a variable in another path and then return.
By David J Fred and others.	2008/08/16

G Series ROM Versions (details)	48 ENG 4KB
Lists the ROM versions used in the G series and the bugs that each of them have.
Author unknown.	1997/08/21

Gamma (details)	48 ENG 2KB
Introduction to the Gamma function.
By Eric Postpischil.	2008/08/16

General Info about Learning Remotes (details)	48 ENG 5KB
General information on making learning remote controllers.
By Julian Taplin.	1998/01/10

General Memory Info (details)	48 ENG 1KB
General information on the 48GX memory structure.
By Dave Arnett.	1998/01/03

Greek Documentation (details)	48 ENG 2230KB
Documentation for the HP 48G Series in Greek, based on HP's Quick Start Guide and User's Guide.
By Hewlett-Packard and others.	2006/11/24

Grob Bug (details)	48 ENG 2KB
Explains a bug related to grobs, that can cause a Memory Clear when attempting to create a grob with one dimension over about a million pixels.
By John Paul Morrison.	2008/08/16

Guide to the HP48GX Hardware (details)	48 ENG 64KB
Detailed information about the HP 48GX with pictures. HTML and Text versions.
By Philippe Teuwen.	1998/07/27

Hiss (details)	48 ENG 3KB
Explains the "hiss" that comes out of the HP 48 keyboard.
By Dave Arnett.	2008/08/17

How To Build A Radio Module 1.0 (details)	49/50 48 39/40 ENG FRA 247KB
Documentation that explains how to build a radio module.
By Bebert and Yoann Désir.	2001/08/19

How to Find the Variables in 'EQ' (details)	48 ENG 2KB
Explains how to find the variables in EQ on a 48.
By Joseph K. Horn.	2008/08/13

How to make a 128K RAM Card (details)	48 ENG 635KB
This file has pictures and documentation explaining how to make a 128K RAM card for the HP 48.
By Olaf.	1997/10/25

How to Make Grayscale Grobs (details)	48 ENG 4KB
Explains how to make grayscale grobs.
By Ricardo Miller.	1997/08/21

How's and Why's to the HP 48 Lobotomization (details)	48 ENG 20KB
Information about the HP 48's memory.
By Steve Sousa.	1999/06/30

HP 28 to HP 48 Changes (details)	48 ENG 5KB
A discussion of some of the differences between the HP 28 and the HP 48.
By William C Wickes.	2008/08/13

HP 28S to HP 48SX Transitions (details)	48 ENG 16KB
A summary of functional differences of 28S operations as implemented on the 48SX. It is not intended to present all of the many improvements and new commands in the 48, but is primarily an aid for 28 users who wish to use their previously-developed programs on the 48. The comments on any given topic are not exhaustive, but are quick summaries of operational differences.
By Stephen J. Thomas.	2017/07/02

HP 41CV Emulator Application Card Overview (details)	48 ENG 18KB
A comprehensive review of the HP82210A HP 41CV Emulator Application Card for the 48SX.
By Stephen J. Thomas.	2017/08/13

HP 48 Cartridge 2.0 (details)	48 ENG POR 121KB
Document explaining a way to upgrade the HP 48 using a NVRAM, Non Volatile RAM (that is, it still keeps data even when there's no power) of 128K from Texas Instruments Corp to make something like a external cartridge. The great advantage of this is that these NVRAM chips can be obtained for free, as TI has a samples program.
By Jonathan B Araujo Neto.	2001/04/15

HP 48 Currents (details)	48 ENG 4KB
Shows current draws of the HP 48SX during various operations.
By Doug Cannon.	1997/08/21

HP 48 I²C Interface (details)	48 ENG 543KB
I2C interface demonstrated at the 1997 London HP conference. Contains the program listings (both for the HP 48 and the PIC microcontroller) and the source of the manual in LaTeX. Tar/GZip archive containing files with Unix EOL characters.
By Tony Duell.	1997/09/29

HP 48 I²C Interface (details)	48 ENG 543KB
I2C interface demonstrated at the 1997 London HP conference. Contains the program listings (both for the HP 48 and the PIC microcontroller) and the source of the manual in LaTeX. PKZip archive containing files with MS-DOS EOL characters.
By Tony Duell.	1997/09/29

HP 48 Schematics 1.6 (details)	48 ENG 286KB
Adobe Acrobat PDF file of the HP 48's schematics (1.6) and circuit board diagram (1.0).
By Marcel Flipse.	2019/10/25

HP 48 USENET archive (details)	48 ENG 117KB
Archive of posts related to the HP 48 in comp.sys.handhelds in 1990.
Author unknown.	1997/09/21

HP 48 USENET software archive (details)	48 ENG 133KB
Archive of software related to the HP 48 posted to comp.sys.handhelds in 1990.
Author unknown.	1997/08/21

HP 48G Series Advanced User's Reference Manual (details)	48 ENG 36933KB
Complete copy of the fourth edition of the HP 48G Series Advanced User's Reference Manual. This PDF document has 764 pages and was scanned at 300 dpi color by an unknown individual. I cleaned up the several hundred megabytes of scanned images and converted them into into a relatively compact black and white PDF file.
By Hewlett-Packard.	2004/05/11

HP 48G Series Quick Start Guide (details)	48 ENG 3838KB
Complete copy of the fifth edition of the HP 48G Series Quick Start Guide. This PDF document has 116 pages and was scanned from the original book.
By Hewlett-Packard.	2012/12/26

HP 48G Series User's Guide (details)	48 ENG 16394KB
Complete copy of the eighth edition of the 48G series instruction manual. This PDF document has 612 pages and was scanned by me at 300 dpi monochrome. Fully bookmarked in order to easily jump between sections. Included on this site with the permission of HP tech support.
By Hewlett-Packard and Eric Rechlin.	2000/09/07

HP 48GX Tutorial in Portuguese 1.02 (details)	48 POR 59KB
Explains how to use the HP 48GX. 31 page Word-document.
By Ricardo Sales.	2000/11/08

HP 48SX Bugs and Fixes (details)	48 ENG 8KB
A list of possible bugs seen in the 48SX Revision D ROM, and an answer from an HP engineer.
By Eric Toonen and William C Wickes.	2017/08/13

HP 48SX Expansion Port Pinouts (details)	48 ENG 3KB
Explains the purpose of all the pins in the expansion port card slot of the 48SX.
By Gary Friedman.	2017/08/13

HP 48SX Feature Summary (details)	48 ENG 5KB
A summary of all the features in the 48SX.
By Wlodek Mier-Jedrzejowicz.	2017/08/13

HP 48SX Hardware Registers Document 1.0 (details)	48 ENG 4KB
Lists the hardware registers of the HP 48SX.
By Julian Taplin.	1997/08/21

HP 48SX Remarks (details)	48 ENG 6KB
Some initial remarks about the 48SX made after its announcement but before its release.
By William C Wickes.	2017/08/13

HP 48SX Review (details)	48 ENG 7KB
A review of the 48SX written in 1991.
By Dan Allen.	2017/08/13

HP Calc Command Comparison (details)	48 28 ENG 18KB
Comparison of the HP 75C, 71B, 28S, 42S, and 48SX commands in MS Works spreadsheet format.
Author unknown.	1998/04/18

HP Calculator History (details)	48 ENG 6KB
Lists code names and prices of nearly every HP calculator, from the 35 to the 48.
By Dan Allen.	1997/08/21

HP Database (details)	48 ENG 458KB
Information about every HP calculator ever made.
By Craig A. Finseth.	2017/07/09

HP Handheld Serial Ports (details)	48 ENG 245KB
Excel spreadsheet showing pinout diagrams for the serial ports in several HP handheld devices (the 48, the 38/49, and the 200LX), as well as the standard RS-232 pinouts and how they map to the HP serial cables.
By Thomas Chrapkiewicz.	2017/05/28

HP Handhelds of the 1980s (details)	48 ENG 24KB
A high-level overview comparing the functionality of the high-end calculators introduced by HP in the 199th decade AD -- the 75, the 71, the 28, the 42S, and the 48SX. Also includes a tab-separated-values list comparing the functions built into each calculator.
By Dan Allen.	2017/07/02

HP Journal article on the HP 48GX (PDF) (details)	48 ENG 196KB
HP Journal article from August 1994 on the HP 48GX in Adobe PDF format. Copyright Hewlett Packard, distributed with permission.
By Hewlett-Packard.	1998/03/15

HP Journal article on the HP 48GX (PS) (details)	48 ENG 526KB
HP Journal article from 1994 on the HP 48GX in PostScript format. Copyright Hewlett Packard, distributed with permission.
By Hewlett-Packard.	1998/03/15

HP Journal article on the HP 48SX (PDF) (details)	48 ENG 9119KB
HP Journal article from June 1991 on the HP 48SX in Adobe PDF format. Copyright Hewlett Packard, distributed with permission.
By Hewlett-Packard.	2017/02/25

HP SoundBooster (details)	48 ENG 623KB
Schematics for a combination 1MB RAM card and sound card. In Adobe PDF format.
By Marcel Flipse.	2000/01/28

HP-Minitel Cable (details)	48 FRA 2KB
Explains how to make an HP 48 to Minitel cable.
Author unknown.	1997/08/21

hp^c Vol. 4 Num. 1 (details)	48 38 ENG 267KB
Newsletter for educators about HP calculators from April, 1998. This issue covers the HP 48G+, HP 38G ApLets, and some general HP calculator information.
By Grapevine Publications.	1998/10/10

hp^c Vol. 4 Num. 2 (details)	48 38 ENG 220KB
Newsletter for educators about HP calculators from September, 1998. This issue covers calculators on the AP Calculus exam, HP 38G ApLets, and some general HP calculator information.
By Grapevine Publications.	1998/10/10

hp^c Vol. 5 Num. 1 (details)	48 38 ENG 193KB
Newsletter for educators about HP calculators from January, 1999. This issue covers defining functions, Taylor polynomial approximation, exponential decay, and general HP calculator information.
By Grapevine Publications.	1999/06/30

hp^c Vol. 5 Num. 2 (details)	48 38 ENG 536KB
Newsletter for educators about HP calculators from April, 1999. This issue covers animated Taylor polynomials, visualizing the pivot from derivative to integral, polar plots, and general HP calculator information.
By Grapevine Publications.	1999/06/30

hp^c Vol. 5 Num. 3 (details)	49/50 48 38 ENG 543KB
Newsletter for educators about HP calculators from September, 1999. This issue covers the 49G, Taylor polynomials, polar plots, and general HP calculator information.
By Grapevine Publications.	1999/10/07

hp^c Vol. 6 Num. 1 (details)	49/50 48 38 ENG 846KB
Newsletter for educators about HP calculators from January, 2000. This issue covers combinatorials, menus, coordinate geometry, limits, and general HP calculator information.
By Grapevine Publications.	2000/06/20

hp^c Vol. 6 Num. 2 (details)	49/50 48 39/40 ENG 872KB
Newsletter for educators about HP calculators from April, 2000. This issue covers the 39G, the 30S, histograms and probability, maximizing volume, recipes, units and key assignments, confidence intervals, and general HP calculator information.
By Grapevine Publications.	2000/06/20

hp^c Vol. 6 Num. 3 (details)	49/50 48 39/40 ENG 670KB
Newsletter for educators about HP calculators from August, 2000. This issue covers the Xpander, factoring on the 39G, sequences on the 30S, derivatives on the 49G, and general HP calculator information.
By Grapevine Publications.	2000/09/01

HP48 I/O Technical Interfacing Guide (details)	48 ENG 24KB
This document gives HP 48 hardware information required to connect serial devices to the wired (serial) I/O port or to communicate with the HP 48 via the 2-way infrared (IR) I/O port.
By Hewlett-Packard.	1997/08/21

HP48G 32KB to 640KB Upgrade 2.0 (details)	48 ENG 323KB
Small PDF document describing a 32KB to 640KB upgrade on a 48G with instructions and photos.
By Joao Carlos Rodrigues Barbosa.	2001/12/20

HP48GX Battery Usage (details)	48 ESP 6KB
Information about the battery usage of many different functions on the 48GX.
By cvag@tinet.fut.es.	1998/01/10

HP48GX Bug (details)	48 ENG 4KB
Explains a bug in the G/GX, rev K-P that causes a Memory Clear when doing statistics (I tried it, it's real!).
By Joseph K. Horn.	1997/08/21

HP82240B Printer Communication Information (details)	48 ENG 3KB
Information about the format of data sent to the HP82240B infrared printer.
By Jarno Peschier.	1997/09/06

HpIrDA (details)	48 39/40 38 ENG 2KB
Document about the basics of the HP calculator and PC IrDA infrared port communication.
By Christoph Gießelink.	2001/10/27

HPUP384k (details)	48 ENG 124KB
Explains (with pictures) how to upgrade your 48G to 384K of RAM.
By Philippe Teuwen.	1997/08/21

I/O Guide (details)	48 ENG 16KB
Gives HP 48 hardware information required to connect serial devices to the wired (serial) I/O port or to communicate with the HP 48 via the 2-way infrared (IR) I/O port. In a weird archaic Unix file format, so it isn't easily readable.
Author unknown.	2008/08/06

I/O Test (details)	48 ENG 3KB
Explains how to test an HP to PC connection without bothering with Kermit.
By Ray Depew.	1997/08/21

Improved Matrix Accuracy (details)	48 ENG 6KB
Shows how the matrix inversion accuracy of the 48GX is better than the 48SX.
By Joseph K. Horn.	2017/07/02

Increase IR Range (details)	48 ENG 3KB
This document explains how to increase the range of the infrared port. Involves opening the calculator and replacing a resistor.
Author unknown.	1997/08/21

Info on UBASE Bug (details)	48 ENG 4KB
Information on a bug in the UBASE command.
By John H Meyers.	1998/10/17

Inside the HP48 (details)	48 ENG 5KB
Tells about what it looks like inside the HP 48.
By David Holmes.	1997/08/21

Installing Libraries (details)	48 ENG 7KB
Explains how to install libraries onto the HP 48. In Word format and from the FAQ.
Author unknown.	1997/08/21

Intervalometer for Canon EOS 1.0 (details)	49/50 48 ESP 236KB
Explains the ways to make a serial link cable between the 48/49G and a Canon EOS camera. Turns the calculator into an intervalometer.
By Abraham Acevedo Garcia.	2008/05/11

Introduction to the HP48 in Spanish (details)	48 ESP 123KB
Explains the very basics of using an HP 48.
By rojecas@maxwell.univalle.edu.co.	1998/11/15

IR Boosting Infomation (details)	48 ENG 2KB
Tells what resistor to replace to increase the IR range to 30' (about 10 meters) or more.
By Scott Marlowe.	1997/09/06

IR Boosting Information 2 (details)	48 ENG 3KB
More information about increasing the range of the infrared port.
By Ivan Blumenschein.	1997/09/06

IR Box 4.0 (details)	48 ENG 30KB
Explains how to make an infrared port booster box for the HP 48.
By Tom Wong.	1997/08/21

IR Information (details)	48 ENG 3KB
This document explains how the infrared port on the 48 works.
By Dave Arnett.	1997/08/21

IR Remote Codes (details)	48 ENG 5KB
Gives technical details about the IR remote control codes use for Sony and RCA equipment (TV, VCR, receiver, etc), useful for making your own universal remote. These codes are already built in to Remote.
By Brian Plumb and Rick McTeague.	2017/08/13

IR to RS-232 Adapter (details)	48 ENG 58KB
Schematics (in PostScript and ASCII) for an IR to RS-232 adapter.
By Tony Duell and Uwe Ziegenhagen and others.	1997/08/21

Iterative Functions and the HP48 (details)	48 ENG 22KB
A look at the remarkable effects that can happen when you repeatedly give a function its own output (the foundation of chaos/fractal theory), some sobering facts on calculator precision, and lots of demo programs.
By Bill Markwick.	1999/05/04

Iterative Functions II (details)	48 ENG 50KB
Sequel to the above document, with information on chaos, order, and the complex plane, and Julia and Mandelbrot fractals.
By Bill Markwick.	1999/10/16

Jornal do HP Club do Brasil 1 (details)	48 POR 104KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	1999/03/13

Jornal do HP Club do Brasil 10 (details)	49/50 48 POR 110KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2000/01/26

Jornal do HP Club do Brasil 11 (details)	49/50 48 POR 107KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2000/02/13

Jornal do HP Club do Brasil 12 (details)	49/50 48 POR 136KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2000/03/14

Jornal do HP Club do Brasil 13 (details)	49/50 48 POR 69KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2000/04/29

Jornal do HP Club do Brasil 14 (details)	49/50 48 POR 71KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2000/06/20

Jornal do HP Club do Brasil 15 (details)	49/50 48 POR 101KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2000/08/23

Jornal do HP Club do Brasil 16 (details)	49/50 48 POR 148KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2000/09/12

Jornal do HP Club do Brasil 17 (details)	49/50 48 POR 97KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2000/11/18

Jornal do HP Club do Brasil 18 (details)	49/50 48 POR 117KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2001/01/03

Jornal do HP Club do Brasil 19 (details)	49/50 48 POR 62KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2001/01/24

Jornal do HP Club do Brasil 2 (details)	48 POR 142KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	1999/04/22

Jornal do HP Club do Brasil 20 (details)	49/50 48 POR 133KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2001/02/12

Jornal do HP Club do Brasil 21 (details)	49/50 48 POR 95KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2001/03/18

Jornal do HP Club do Brasil 22 (details)	49/50 48 POR 68KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2001/05/18

Jornal do HP Club do Brasil 23 (details)	49/50 48 POR 64KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2001/07/16

Jornal do HP Club do Brasil 24 (details)	49/50 48 POR 124KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2001/10/27

Jornal do HP Club do Brasil 25 (details)	49/50 48 POR 57KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2002/02/16

Jornal do HP Club do Brasil 26 (details)	49/50 48 POR 175KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2003/05/06

Jornal do HP Club do Brasil 27 (details)	49/50 48 POR 198KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2003/05/12

Jornal do HP Club do Brasil 28 (details)	49/50 48 POR 381KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2003/07/01

Jornal do HP Club do Brasil 29 (details)	49/50 48 POR 299KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	2003/12/26

Jornal do HP Club do Brasil 3 (details)	48 POR 139KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	1999/05/13

Jornal do HP Club do Brasil 4 (details)	49/50 48 POR 398KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	1999/06/12

Jornal do HP Club do Brasil 5 (details)	49/50 48 POR 235KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	1999/07/13

Jornal do HP Club do Brasil 6 (details)	49/50 48 POR 129KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	1999/08/13

Jornal do HP Club do Brasil 7 (details)	49/50 48 POR 121KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	1999/09/14

Jornal do HP Club do Brasil 8 (details)	49/50 48 POR 334KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	1999/11/15

Jornal do HP Club do Brasil 9 (details)	49/50 48 POR 109KB
Newsletter in Portuguese from the HP Club of Brazil. In MS Word 97 and Adobe PDF format.
By Tacio Philip Sansonovski.	1999/12/14

Jumper Information (details)	48 ENG 2KB
Explains why there are jumpers on the HP 48G series to adjust the clock speed.
By Dave Arnett.	1997/09/06

Key Locator Chart (details)	48 ENG 18KB
Lists the keystrokes necessary for every function in the 48G series.
By Jake Schwartz.	2017/08/05

Key Table (details)	48 ENG 4KB
Lists the key assignments on the 48S series that are useless at certain times and thus ready to be reassigned.
By Simone Rapisarda.	2008/08/17

LASTARG (details)	48 ENG 2KB
Explains how to use LASTARG to recover from stupid keyboard mistakes involving PURGE, STO, and shift-STO.
By Joseph K. Horn.	2008/08/17

LIBEVAL list (details)	48 ENG 3KB
Listing of LIBEVALs from the G series.
By Joseph K. Horn.	1998/01/03

Library ID Numbers (details)	48 ENG 16KB
Listing of many of the currently used library ID numbers.
By Joseph K. Horn and Balazs Fischer and others.	1998/06/08

Library IDs for HP 48 (details)	48 ENG 51KB
Listing of the numbers of library ID's of all easily-identifiable libraries for the HP 48 that are contained on this web site. Automatically updated every Sunday (despite the date in this listing).
By Carsten Dominik.	2001/03/09

Library IDs on Goodies Disks (details)	48 ENG 16KB
Listing of the library ID numbers in use on the Goodies Disks and various ROM cards.
By Joseph K. Horn.	2008/08/17

Life is Short and ROM is Full (details)	48 ENG 2KB
The original source of the "life is short and ROM is full" quote.
By William C Wickes.	2008/08/17

Links to Manuals 1.1 (details)	49/50 48 ENG ESP POR 1KB
Contains a text file that gives the addresses on HP's site from which one can download PDF versions of HP 48 and HP 49 instruction manuals in various languages.
By Julián Kaihara.	2002/11/17

Long Ago (details)	48 ENG 1KB
A couple predictions about calculators from "The Hewlett-Packard Personal Calculator Digest, Volume two, 1977".
By Hewlett-Packard.	2008/08/17

Making a PC to HP Link Cable (details)	48 ENG 8KB
Easy to follow directions for making a PC to HP link cable.
By Vimal Bhalodia.	1998/05/04

Marketing Plan for HP's High End Calculator Line (details)	48 ENG 316KB
A 66-page user community analysis suggesting a possible marketing plan for HP. In Adobe PDF format.
By Richard Nelson and others.	2000/04/29

Memory Card Info (details)	48 ENG 11KB
This document explains how the memory cards for the HP 48 series work.
By Darryl Okahata.	1997/08/21

Memory Scanner (details)	48 DEU 10KB
Information on the S-series memory scanner.
By Peter Farwig.	1998/01/12

Modifying Epson RAM cards (details)	48 ENG 8KB
Explains how to modify Epson RAM cards for use in the HP 48.
By Allan Petersen.	1998/02/28

Mystery Mini Challenge (details)	48 ENG 1KB
This bizarre-looking User RPL program takes any real integer and returns the number of bits required to express it in binary. Mini-Challenge: figure out why it works.
By Joseph K. Horn.	2008/08/12

Newton's Method (details)	49/50 48 ENG 5KB
This pdf file goes over Newton's Method in lengthy detail. It provides how to program and use your calculator for Newton's Method.
By Aaron Toponce.	2002/11/14

Not a Bug (details)	48 ENG 2KB
Explains that it's not a bug that the result is imprecise when trying to raise 125 to the 1/3 power.
By Joseph K. Horn.	2008/08/17

Not a Bug 2 (details)	48 ENG 2KB
Explains that it's not a bug, but rather a limitation, that you cannot use exponents on units higher than 127.
By Erik Naggum.	2008/08/17

Null Names (details)	48 ENG 9KB
Information about null-named variables and directories.
By Rick Grevelle.	2008/08/17

Null Programs (details)	48 ENG 3KB
Explains how to execute a program while there is a command line.
By Simone Rapisarda.	2008/08/17

Nyquist Plots (details)	48 ENG 1KB
Explains how to do Nyquist plots using the parametric plotter.
By Erin S. Catto.	2008/08/17

Object Oriented Manifesto (details)	48 ENG 26KB
Huge document (74 KB) explaining why the HP 48 is object oriented (and other things).
By Chrstphre Campbell (TinyWanda).	1998/06/17

On-D Tests (details)	48 ENG 12KB
Excerpt from the FAQ listing the various On-D diagnostic tests.
Author unknown.	1997/12/11

On-key Combinations (details)	48 ENG 4KB
Lists the various On-key combinations.
By Dave Arnett.	1997/12/11

Overclocking (details)	48 ENG 85KB
How to easily overclock the HP 48. This may be a joke...
By Nacho Vilalta.	2002/02/16

Parentheses Bug/Feature (details)	48 ENG 1KB
Explains a bug/feature involving parentheses and the equation writer in ROMs A-E of the S series.
By Chris Holsapple.	2008/08/17

PC Link Cable Mould Designs (details)	49/50 48 ENG 21KB
Detailed mold design to manufacture a plug for an RS-232 cable for the PC to calculator serial interface.
By John de Ponte.	2001/05/26

PC-HP Cable Instructions (details)	48 DEU 5KB
Explains how to make a PC-HP serial cable.
Author unknown.	1997/08/31

PDL Spec Sheet (details)	48 ENG 832KB
Specifications sheet in PDF format for the Firmware Systems Portable DataLab.
By Firmware Systems.	1999/07/31

Port Path Bug (details)	48 ENG 2KB
Identifies a bug in the GX where the RCL command does not work properly when given a high port (2 or higher) and a path to a variable.
By Joseph K. Horn.	2008/08/17

Potential 512k Chip Problem (details)	48 ENG 2KB
Explains a mistake made in some documentation for adding a 512k chip.
By Blake T. Garretson.	1998/07/24

Power Consumption (details)	48 ENG 7KB
Shows the power consumption of a 48G upgraded to 256 KB of RAM.
By Robert Tiismus.	1998/09/28

Program Development Link Comments (details)	48 ENG 7KB
Review of the HP Program Development Link.
By James Dixson.	2017/08/13

Purging Libraries with ID<100 (details)	48 ENG 2KB
Explains how to purge libraries that have ID numbers of less than 100.
By Joseph K. Horn.	1997/08/21

QUOTE and APPLY (details)	48 ENG 2KB
Explanation of the QUOTE and APPLY functions.
By Charles Patton.	2017/07/01

RAND (details)	48 ENG 3KB
Identifies the algorithm used by the random number generator.
By Detlef Müller and Steve VanDevender.	2008/08/17

Random Numbers (details)	48 ENG 9KB
Lots of information on random numbers with the 48, including chances of getting a repeated number.
By Klaus Wolferts, John H Meyers, and Steve VanDevender.	1999/01/06

RC48-512 RAM Card (details)	48 ENG 417KB
A design for a 512 KB RAM card for the 48GX, including a schematic and photos and all layout files.
By Paul Onions.	2017/06/11

Recovering Memory (details)	48 ENG 3KB
Explains what happens when you choose "yes" at the Try To Recover Memory screen.
By Joseph K. Horn.	2008/08/17

Revision F (details)	48 ENG 2KB
Explanation of why there are ROM revision letters and why there is no F despite evidence to the contrary.
By William C Wickes.	2008/08/17

Revista de la ETSIIG de Gijón, Febrero 2001 (details)	49/50 48 ESP 464KB
Newsletter of the users club of the ETSIIG of Gijón. Talks about the HP 48, HP 49, and GNU software.
By CdU ETSIIG.	2001/05/18

Revista de la ETSIIG de Gijón, Marzo 2001 (details)	49/50 48 ESP 464KB
Newsletter of the users club of the ETSIIG of Gijón. Talks about the HP 48, HP 49, and GNU software.
By CdU ETSIIG.	2001/05/18

Revista del CdU ETSIIG (details)	48 ESP 966KB
Periodical publication that talks about the HP 48 and HP 49 and engineering software.
By CdU ETSIIG.	2001/04/04

ROM Version in S Series (details)	48 ENG 2KB
Lists three ways to find the ROM revision in the 48S series.
By Joseph K. Horn.	2008/08/17

ROM Version Information (details)	48 ENG 9KB
Excerpt from the FAQ listing the various ROM versions and their differences.
Author unknown.	1997/12/12

RS-232/IR Interface (details)	48 ENG 58KB
Instructions explaining how to make an IR transceiver performing signaling format conversion between the Hewlett-Packard proprietary IR format used on the HP 48, and the standard RS-232 signaling used on any serial port. In PDF format.
By Berni Joss.	2000/07/16

Rules (details)	48 ENG 3KB
Explanation of the names on the RULES 48G-series easter egg.
Author unknown.	1997/12/11

Scatter Plots with Lines (details)	48 ENG 1KB
Explains how to make scatter plots with lines connecting the points.
By Jurjen N.E. Bos.	2008/08/17

Scientific Comparison (details)	48 ENG 264KB
Comparison of entry level scientific calculators. Compares the HP-30S with the TI-30XII and TI-34II. Designed to help one decide on a cheap, backup calculator to buy.
By Tim Wessman.	2001/10/27

Secret Reset Switch (details)	48 ENG 3KB
All about the Secret Reset Switch hidden inside your HP 48.
By Joseph K. Horn and Ray Depew and others.	2008/08/17

Serial Cable Pinouts (details)	48 ENG 3KB
Explains the pinouts for serial cables for connecting the HP to PCs, Macs, or Minitel machines.
By Johan Thornton and Preston Brown and others.	1997/09/21

Serial Connector (details)	48 ENG 3KB
Information about making a connector to plug into the HP 48 serial port.
By Jeremy Smith.	1998/02/28

Serial Port Pinouts (details)	48 ENG 3KB
Explanation of the serial port pinout on the HP 48.
Author unknown.	1997/08/21

Server Mode: The Whole Scoop (details)	48 ENG 4KB
Thoroughly explains all the packets that are sent while in Kermit server mode.
By Joseph K. Horn.	2008/08/17

SmartROM Documentation (details)	48 ENG 286KB
Documentation for the SmartROM ROM card previously available at EduCalc, in plain text, PDF, IBM printer, and HP printer format.
By Smart Technology.	2020/12/30

SMI RAM Cards (details)	48 ENG 3KB
Information about the RAM cards that SMI used to make for the HP 48.
By Joseph K. Horn.	1998/07/24

Smith Corona RAM Cards (details)	48 ENG 2KB
One user's experience with Smith Corona RAM cards in the HP 48.
By Robin Getz.	1997/09/06

Softkey Index (details)	48 ENG 11KB
Lists all of the 48GX's softkeys and shows what buttons to press to get to those softkeys.
Author unknown.	1998/01/23

Some Notes about HP 48SX and 50g Calculators 1.0 (details)	49/50 48 ENG 254KB
Gives information about doing a few things on the calculators, including evaluation of polynomials, and corrections to the official manuals.
By Alberto Maria Marchetti.	2011/07/24

Spanish HP 48 Tutorial (details)	48 ESP 128KB
Spanish HP 48 tutorial to learn what the HP 48 can do in expert hands.
By Miguel Quintana Villalba.	2003/12/24

Speed up the HP 48? (details)	48 ENG 1KB
Gives some basic information about the clock speed of the HP 48 and how it is set.
By Preston Brown.	1997/12/12

Stat-related Bug (details)	48 ENG 3KB
Describes a stat-related bug involving SigmaDAT in G series revisions K through P.
By Joseph K. Horn.	2008/08/17

Submenus in CST menu (details)	48 ENG 3KB
Shows how to make "tabbed" items for submenus in the CST menu.
By Joseph K. Horn.	1997/08/21

SX RAM Upgrade (details)	48 ENG 19KB
Explains how to upgrade the RAM in a 48SX.
By Stephane Grundschober.	1998/05/07

Symbolic Division (details)	48 ENG 3KB
Explains how to do symbolic division.
By Joseph K. Horn.	2008/08/17

The Canonical List of HP 48 Flag Usage (details)	48 ENG 4KB
Table includes both User Flags and System Flags. Definitions already in the HP literature are not included here. Flags which the user need not worry about are not included here.
By Joseph K. Horn.	2008/08/13

The HP 48 Programmer's ToolKit Review (details)	48 ENG 8KB
A thorough review of James Donnelly The HP 48 Programmer's ToolKit.
By Alonzo Gariepy.	2017/08/13

The Matrix (details)	48 ENG 10KB
Kind of interesting for people who have used the Internet for a long time. Explains how to get HP 48 software and discusses email from back in 1991.
By Jeremy Smith.	1998/01/11

Token Ring Network (details)	48 ENG 19KB
Explains how to network several HP 48s with a token ring network.
By Daniel Roggen.	1998/01/11

Token Ring Network (2) (details)	48 FRA 3KB
Something about the above network setup, but I can't read it since it's in French.
By Daniel Roggen.	1997/09/06

Trace like HP 28 (details)	48 ENG 1KB
Shows how to replicate the TRACE functionality of the HP 28 on the HP 48.
Author unknown.	2008/08/17

Trigonometry Marathon 1.4 (details)	49/50 48 ENG 553KB
Detailed documentation of the capabilities of the HP 49G when working with trigonometric expressions. Orthographically corrected version with better layout.
By Nick Karagiaouroglou.	2003/07/16

Trivia on HP Handheld Calculators and PDAs (details)	48 ENG 461KB
Lots of good information about virtually every HP handheld calculator or PDA. Contains 58 pages of excellent trivia. This is a pre-release version, so any errors should be reported to the author. In PDF format.
By Marc Staps.	2000/04/10

Turn Off Auto-Shutoff (details)	48 ENG 2KB
Explains how to disable the 10-minute auto shutoff (doesn't look very easy, though).
By Dave Arnett.	1997/09/06

Tutorial de Integrais (details)	48 POR 40KB
Explains how to do integrals on the 48G series. In Word 97 format.
By Carlos Marangon.	2017/07/26

Two Easy Ways to Speed Up Your HP 48 Keyboard (details)	48 ENG 2KB
Tells how to speed up the keyboard on the 48: disabling user keys, and staying out of the library menu.
By Joseph K. Horn.	2008/08/17

Undocumented HP 48SX features (details)	48 ENG 3KB
Lists some undocumented features in the 48SX, mostly related to I/O communications.
By Tony Duell.	2017/08/13

Unit Reduction (details)	48 ENG 4KB
HP Customer Support's explanation of how unit reduction works.
By Hewlett-Packard.	2008/08/17

Universal Lab Interface Software Developer's Guide (details)	49/50 48 ENG 206KB
The Universal Lab Interface can be used with virtually any computer that has a serial communication port. This opens the door for use with the HP 48GX and 49G calculators, both of which have a serial port.
By Vernier Software.	2003/12/27

Upgrades (details)	48 ENG 6KB
German document explaining how to upgrade the HP 48.
Author unknown.	1997/12/11

User Flags (details)	48 ENG 2KB
Explains what user flags are used for.
By Greg Sanker.	2008/08/13

Using a Modem (details)	48 ENG 4KB
Explains how to connect and use a modem with a 48.
By Diego Berge.	1998/08/01

Using HP 48 Backups With Emu48 (details)	48 ENG 2KB
Explains how to copy the data of a real HP 48 to Emu48 using the backup feature.
By Christoph Gießelink.	2002/01/22

Using Smith Corona RAM Cards (details)	48 ENG 12KB
Explains how to use Smith Corona RAM cards in the HP 48.
By Allan Petersen.	1997/09/06

USRLIB Tips (details)	48 ENG 5KB
Frequently asked questions (and their answers) regarding USRLIB, for making libraries.
By Joel Nevison.	1997/12/11

Vectored Enter (details)	48 ENG 2KB
Explains the undocumented (in the 48SX) vectored enter functionality.
By William C Wickes.	2008/08/17

Vernier LabPro Technical Manual (details)	49/50 48 ENG 346KB
This is the Technical Manual for the Vernier Software LabPro Interface for those adventurous HP programmers out there that might like to try to interface their HP calculators to this device.
By Vernier Software.	2003/12/27

Visio Cable HP 48 (details)	48 ESP 104KB
Graphically explains how to make a cable for the HP 48. In PDF format.
By Fidel Moreno.	2003/08/30

Why did you buy the HP 48? (details)	48 ENG 7KB
Several users' reasons on why they bought the HP 48.
By Kevin Jessup and Ray Depew.	1997/12/12

Wire vs Infrared (details)	48 ENG 3KB
Which takes more power, infrared or wire transfers?
By John Wettroth.	2008/08/17

Yards, Feet, and Inches (details)	48 ENG 4KB
Discusses the conversion of numbers involving yards, feet, and inches.
By Joseph K. Horn and Jan Brittenson.	2008/08/17

Part of the HP Calculator Archive,
Copyright 1997-2023 Eric Rechlin.