The Walsh Computer Technology
Computer Collection Web Pages


Welcome! These pages contain information on IBM Personal System/2 Model 25 computers as well as some Microchannel expansion bus and other IBM PS/2 hardware related information. I lost much of my collection from a major basement flood in 2004 caused by the negligent behavior of city government. Updates since then have been pretty sporadic if they happened at all.

In recent times (relative to when I'm writing this in early 2026), I'm not doing nearly as much with PS/2 systems and Microchannel hardware as I used to. It's been a good, long ride. Much of this computer hardware provided enormous value in terms of learning experiences, far beyond its purchase price. Unfortunately, time gets even with stuff in ways that aren't always easy or possible to fix. People and their interests change. The majority of contemporary operating systems don't run on this hardware any longer and software of the time is increasingly left behind as new features and security measures come along that will never be well supported (if at all) by that older software. When you can find some current software that still consents to working on this hardware, that software and the things one interacts with (like web pages) have often become too "heavy" a burden for these systems, no matter how heavily upgraded they are. That said, I still have a few systems around in working order and sometimes it is fun to revisit the past.

I don't have parts of any kind for sale. Nor do I plan to part with the complete systems I still have.

These web pages will certainly remain online, though largely unchanged from how they currently exist.

Please feel free to drop me a line. I may not always be the quickest to respond, but I love to read e-mail and will reply as soon as I can! Should you not get a reply, please check your spam filter or junk e-mail folder. -- WW, March/April 2026


If you have some IBM PS/2 or Microchannel hardware that's in need of being rescued, please take a moment and drop me a line. I'm still generally interested in doing so.


 

 

 

 

 

 

 

 

PS/2s I Own

Miscellaneous Information

Microchannel & PS/2 Projects

Model 25/Eduquest (Info Page & Pics)
(includes clock battery information)

Digital EtherWorks Stuff

Model 30 (286 and 8086)

Other PS/2
Related Links

(many of which are long gone)

Novell NE-32 Adapter Info

The "Turbo 30" Project

Arco AC-1070 MCA IDE
Adapter CD-ROM
Drive Support

Model 33 "E"

Shiva FastPath 5 Information

Hacking Drive Rails
for Models 40, 57, and 77

Model 35SX
Model 35SLC
Model 40SX

Computers Featured In My
Collection Are NOT For Sale

Kingston SXNow!
Upgrade Information

Model L40SX

Check the PS/2 Links section for
much more useful info!

AOX MCMaster 286>386
Upgrade Instructions and
Files

Models 50 and 50Z
Model 50 w/ Reply Board


Illustrated L40SX
Notebook Disassembly Guide

PS/2 Note N51SX
Model 53


Telxon Wireless MCA NIC
info and outline...

Model 55SX


Pure Data ArcNet

Model 56SLC


Fan Replacement For The
Kingston TurboChip 133

Model 56SLC3

IBM Model M Keyboard
Modification Info

(required on some newer motherboards)

Model 57SLC

MPG123 For AIX on RS/6000

Model 57SLC2 486


Model 60 

IBM PCCBBS Stuff
Look here for selected items!

Model 65SX - Unit 1
Model 65SX - Unit 2

IBM PS/2 Schematics!

Model 70 (E61)

Model 70 (A21)

Model P70 (8573-121)

Model P75 (8573-401)

Model 76 (Lacuna)

Model 76 (Bermuda)

Model 77 (Bermuda)

Model 77 (Lacuna)

Model 77 (Ultimedia Lacuna)

Model 80
Model 80 with Core International ESDI Disks & Controller


Model 85

Model 90
Model 95
PS/2 Server 95
PS/2 Server 95A
PC Server 500
Non IBM Microchannel Architecture Machines
NCR System 3300
Reply Model 32
Curiosities
IBM 6152 Academic System
IBM 7186 (Black Cased P70)

 

 

 

 

























 

 

 

 

 


 

 


 

 

 

 

 










Contents Copyright © 1997-2026 by Walsh Computer Technology. Some Rights Reserved. Last Updated: 03/29/2026, previously updated 08/25/2019 and 05/03/2015.

A word about Copyright, bandwidth and other good to know information: I don't believe in being a jerk when it comes to the use of material I've created or written. Unfortunately, I've had to deal with people who have chosen to do so in the past. I'd ask that you provide credit where it's due. Don't claim that you created something if you didn't. Don't sell or exchange things of value (whether tangible or not) for access to this information. You got it for free (or should have) and so should anyone you provide copies of this information to. Don't "hotlink" things from this site -- doing so may result in something surprising replacing the item you linked to! Please do consider checking occasionally to see if your copy of something is in need of being updated.

Images--persuant to the terms above, you may use my original images and artwork. However, you are not allowed to remove any copyright or other identifying mark from the images. Likewise, images are not to be modified in other way than palette optimization, sizing changes or file format. If you wish to link to an image from this site--DO NOT link directly to the image. Take a copy and host it on your web space. Failure to do this may result in something surprising replacing the image you are using!