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 40,256 KB in this category.

AddHard 48   (details) 48 ENG   1,205 KB
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   11 KB
Describes an alternative (less destructive) method of taking apart the HP 48.
By David Fenyes. 1997-08-21

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

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

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

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

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

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

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

DomeHP07.jpg   (details) 48 ENG   12 KB
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   11 KB
Yet another 48G opening/RAM expansion guide.
By Paul Smith and others. 1997-08-21

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

How2Open   (details) 48 ENG   1,683 KB
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   4,971 KB
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   25,083 KB
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   1 KB
Description file to go with the images below.
By KENDY. 1997-08-21

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

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

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

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

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

HP Inside 6   (details) 48 ENG   112 KB
HP-board, GX (!) model, slot-detail.
By KENDY. 1997-08-21

HP48G 32KB to 640KB Upgrade 2.0   (details) 48 ENG   323 KB
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   189 KB
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   53 KB
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   115 KB
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   214 KB
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   6 KB
Explains how to open the 48G with minimal damage.
By Scott Marlowe. 2017-08-05

OpenHP48   (details) 48 ENG   2,530 KB
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   25 KB
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   6 KB
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   9 KB
This document explains how to open and upgrade the RAM of the 48G.
Author unknown. 1997-08-21

RAM Upgrade Directions   (details) 48 ENG   941 KB
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   1,924 KB
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 1997-2024 Eric Rechlin.