The Walsh Computer Technology
Computer Collection Web Pages

There is "new technology", and there is "high technology".
An IBM MCA machine is still a "high technology" computer.
-"Speedfrog" Bill from CSIPH


Welcome! These pages contain information on IBM Personal System/2 Model 25 computers as well as some MCA and PS/2 related hardware information. I've also posted some pages about a few of the various PS/2 and Microchannel clone systems I own, both now and in the past. (Unfortunately, my collection was heavily damaged in a 2004 flood caused by the negligent behavior of city administration. Many things could be saved, some could not and others slipped away before I knew one way or the other. Ever since that time, updates to this page have been...sporadic...at best. As such, many things have fallen into disrepair. I make no claim that information here will be updated on any kind of a schedule, or even at all.)

New! Schematics for selected IBM PS/2 models are available as of June 2015. Link present in the table below, on the right hand side.

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.


If you're looking for disks relating to IBM PS/2s, option cards or anything related that was once on the IBM PCCBBS, you should know that IBM/Lenovo has taken this stuff down. I have a mirror of this stuff (see the lower right corner of this page), although until recently the links did not work. (No thanks at all to Dynamic DNS Network Services, who rendered their free services useless after the last major update to this page in 2006.)

I am always looking for PS/2s, Microchannel hardware and any Microchannel clones that are in need of new homes. If you're located in the US and have such things, send me an e-mail through the link above. Likewise, if you have PS/2 or Microchannel software, manuals or any other resources...drop me a line!


 

 

 

 

 

 

 

 

PS/2s I Own

Miscellaneous Information

Microchannel & PS/2 Projects

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

MCA Picturebook

(more or less deprecated at this point, out of date,
and subject to potential removal...)

Digital EtherWorks Stuff

Model 30 (286 and 8086)

Other PS/2
Related Links

(many of these are bad)

Novell NE-32 Adapter Info

The "Turbo 30" Project

9595 Ardent Tools of
Capitalism
V2 Adaptation

(not really even vaguely maintained, but still useful)

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

Model 33 "E"

Shiva FastPath 5 Information

(updated September 2013)

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

My Thoughts On Various MCA
Cards and Related Hardware

Model 60 

IBM PCCBBS Stuff
Look here for selected items!
Look here for everything from
the former IBM PCCBBS!

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 ESDI Disks & Controller


Model 85

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

 

 

 

 

























 

 

 

 

 


 

 


 

 

 

 

 










Contents Copyright 1997-2015 by Walsh Computer Technology. Some Rights Reserved. Last Updated: 05/03/2015.

A word about Copyright, bandwidth and other good to know information: I generally don't believe in being an ass when it comes to using my materials for other projects or taking copies/making mirrors. I believe it is far more important that people can continue to benefit from any information or illustration I have posted here than it is to be a real stickler about copyright. Nevertheless, these pages, my original text, original photographs are copyrighted material. You may freely copy or distribute any of these items or use them in your own work. However, no costs are to be charged for access to this information, except for reasonable duplicating, media or access time costs. You may not use these works in any for-profit enterprise without getting my written permission.This includes eBay auctions. If you want to use these items in a for-profit enterprise or project, please ask my permission. I'll probably give it to you unless you're doing something illegal, of bad taste, dangerous or immoral. Note that nothing here may be used to violate any law or endanger any person. If you do this, I will ask you to remove the items you have used that belong to me. If you do use material from this site, please credit the authors. A link back to the page where the materials you are using are located would be nice, but is not required.

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!