hpcalc.org - HP 48 Archive

Instructions on Opening the HP 48

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

There are 34 files totaling 39976KB in this category.

AddHard 48   (details) 48 ENG   1205KB
This .zip file contains a lot of information in the form of text files and pictures about opening and modifying the HP 48. It covers topics such as networking, memory upgrades, RAM cards, connection cables, and opening the case using two different methods.
Author unknown. 1997/08/21

Apart 48   (details) 48 ENG   11KB
Describes an alternative (less destructive) method of taking apart the HP 48.
By David Fenyes. 1997/08/21

DomeHP00.txt   (details) 48 ENG   2KB
Description file to go with the DomeHP images.
By Andrea Domenichini. 1997/08/21

DomeHP01.jpg   (details) 48 ENG   86KB
Complete image of the ORIGINAL internal top part of the opened HP 48G.
By Andrea Domenichini. 1997/08/21

DomeHP02.jpg   (details) 48 ENG   60KB
Complete image of the ORIGINAL internal bottom part of the opened HP 48G.
By Andrea Domenichini. 1997/08/21

DomeHP03.jpg   (details) 48 ENG   39KB
Zoomed-in vision of the RAM/ROM original part of the HP.
By Andrea Domenichini. 1997/08/21

DomeHP04.jpg   (details) 48 ENG   25KB
Very zoomed-in vision of the added SMD 74HC00.
By Andrea Domenichini. 1997/08/21

DomeHP05.jpg   (details) 48 ENG   81KB
Complete image of the UPGRADED internal top part of the opened HP 48G.
By Andrea Domenichini. 1997/08/21

DomeHP06.jpg   (details) 48 ENG   62KB
Complete image of the UPGRADED internal bottom part of the opened HP 48G.
By Andrea Domenichini. 1997/08/21

DomeHP07.jpg   (details) 48 ENG   12KB
Very zoomed-in external vision of the added dip-switch under top-left rubber foot, which serves to swap between Read/Write and Only Read State of the second 128kB chip.
By Andrea Domenichini. 1997/08/21

Expanding RAM in the G   (details) 48 ENG   11KB
Yet another 48G opening/RAM expansion guide.
By Paul Smith and others. 1997/08/21

How to open your HP48   (details) 48 ENG   10KB
This has basic information about opening the 48G/S.
By Paul Smith. 1997/08/21

How2Open   (details) 48 ENG   1682KB
This is a tar'ed, gzip'ed file of the HTML document how2open.htm, and the jpegs that go with it giving illustrated instructions on how to open your HP 48 by making cuts from the back, severing rivets inside the case.
By Adrian Drury. 1997/08/21

HP 48 Repair   (details) 48 ENG   4971KB
Contains documentation and 45 photographs explaining how to open the HP 48 series for repair, including tips on repairing screen and keyboard problems.
By Han Duong (HPSolo). 2005/12/01

HP 48SX Keyboard Replacement and LCD Upgrade   (details) 48 ENG   25083KB
Shows how to open a 48SX, replace its keyboard, and upgrade the LCD to a black-and-white-one from a 39G. In PDF format.
By Sanjeev Visvanatha. 2019/04/22

HP Inside   (details) 48 ENG   1KB
Description file to go with the images below.
By KENDY. 1997/08/21

HP Inside 1   (details) 48 ENG   79KB
Disassembled HP 48, whole view.
By KENDY. 1997/08/21

HP Inside 2   (details) 48 ENG   100KB
HP-board with 256K-PCB, top view.
By KENDY. 1997/08/21

HP Inside 3   (details) 48 ENG   104KB
HP-board with 256K-PCB, right side.
By KENDY. 1997/08/21

HP Inside 4   (details) 48 ENG   62KB
Bottom of HP case + R/W dip-switch.
By KENDY. 1997/08/21

HP Inside 5   (details) 48 ENG   122KB
HP-board, GX (!) model, top view.
By KENDY. 1997/08/21

HP Inside 6   (details) 48 ENG   112KB
HP-board, GX (!) model, slot-detail.
By KENDY. 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

HP48G128   (details) 48 ENG   189KB
Picture of a HP 48G circuit board on a workbench, with 128 K of RAM (using SMD RAM chips). Also faster than normal.
Author unknown. 1997/08/21

HP48SX + 128 K   (details) 48 ENG   53KB
Photos (and a very brief explanation) of a 48 SX upgrade with a 128 K SRAM.
By Istvan Totka. 2003/01/10

HPAUSB_1   (details) 48 DEU   115KB
Side view of an HP 48G circuit board on a workbench that has been upgraded to 384K, using two stacked DIP chips.
Author unknown. 1997/08/21

HPAUSB_2   (details) 48 ENG   214KB
Top view of an HP 48G circuit board on a workbench that has been upgraded to 384K, using two stacked DIP chips.
Author unknown. 1997/08/21

Open HP   (details) 48 ENG   6KB
Explains how to open the 48G with minimal damage.
By Scott Marlowe. 2017/08/05

OpenHP48   (details) 48 ENG   2530KB
Pictures and text explaining how to open your 48G without damaging it, using only one tool.
By Pawel Golaszewski. 2001/06/03

Opening from Front   (details) 48 ENG   25KB
Shows how to open the HP 48 by drilling from the front without taking of the keyboard overlay.
By Jim Cook. 1998/07/24

OpenIt2.txt   (details) 48 ENG   6KB
This file shows a mail order source for 128k RAM chips. It also includes basic information about performing the upgrade.
By Brad Keef. 1997/08/21

RAM Expansion Guide   (details) 48 ENG   9KB
This document explains how to open and upgrade the RAM of the 48G.
Author unknown. 1997/08/21

RAM Upgrade Directions   (details) 48 ENG   942KB
The best RAM upgrade guide I have found. Has many pictures and HTML documents providing an easy to follow RAM upgrade guide.
By Stephane Grundschober. 1998/01/07

USB48G - Upcycle Broken HP 48 Keyboard   (details) 48 ENG   1644KB
Shows how to "upcycle" a broken 48 to turn it into a USB keyboard.
By Michael P.. 2019/05/27

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