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yann64andClaude Opus 5.5 b274874139 All machines linked to their forum thread (full comment import)
1,289 discussions, 9,527 archived comments; pages no longer carry the comments themselves.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ
2026-10-13 17:26:43 +02:00

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---
title: IBM PS/1
categories:
- Computers
params:
name: PS/1
image: /media/museum/photos/ibm_ps1_1s.jpg
company: /companies/ibm
company_name: IBM
tabs:
- photos
- links
- docs
- videos
forum_thread: 1239
photos:
- title: IBM PS/1
subtitle: ''
text: Thanks to IBM for this picture
image: /media/museum/photos/ibm_ps1_1.jpg
- title: IBM PS/1 EXPLAINED
subtitle: ''
text: Thanks to Kia Purity for this picture
image: /media/museum/photos/ibm_ps1_explained.jpg
- title: FRONT
subtitle: ''
text: Thanks to Kia Purity for this picture
image: /media/museum/photos/ibm_ps1_front-scheme_1.jpg
- title: BACK
subtitle: ''
text: Thanks to Kia Purity for this picture
image: /media/museum/photos/ibm_ps1_back_1.jpg
- title: EXPANDED WITH A 5.25'' DISK DRIVE
subtitle: ''
text: Thanks to Kia Purity for this picture
image: /media/museum/photos/ibm_ps1_expanded.jpg
- title: BOOT SCREEN / MENU
subtitle: ''
text: Thanks to Kia Purity for this picture
image: /media/museum/photos/ibm_ps1_boot-screen_1.jpg
links:
- title: 'PS/1: a machine for the masses'
url: http://findarticles.com/p/articles/mi_m1563/is_n3_v9/ai_10392355
text: article from Home Office Computing, March, 1991 by Patrick Henry
- title: Silicium.org - PS/1 page
url: http://www.silicium.org/ibm/ibm/ibmps1.htm
text: Interesting comment
- title: Wikipedia
url: http://en.wikipedia.org/wiki/IBM_PS/1
text: PS/1 article
docs:
- title: HARDWARE MAINTENANCE SERVICE FOR IBM PS/1
url: null
cover: /media/museum/docs/couvs/ibm_ps1_hardware-maintenance-manual2.jpg
text: |-
**HARDWARE MAINTENANCE SERVICE FOR IBM PS/1**\
written by IBM
 compiled/archived by Rãzvan Corneliu C.R. VILT\
 type of document : Online reader
**... READ THE ONLINE VERSION BY CLICKING BELOW :**
videos:
- title: PS/1 TV commercial
url: https://www.youtube.com/watch?v=QNQqTA9Pmb8
text: 'Length: 2 min 31 s'
related:
- /museum/amstrad-pc-1512
- /museum/amstrad-pc-1640
- /museum/amstrad-ppc-512-640
- /museum/ibm-pc-at
- /museum/ibm-pc-model-5150
- /museum/ibm-pc-portable-model-5155
- /museum/ibm-pc-xt-286
- /museum/ibm-pc-xt-model-5160
- /museum/micronique-hector-xt
oc_id: 1274
source:
url: https://web.archive.org/web/20230531222407/http://www.old-computers.com/museum/computer.asp?c=1274
date: '2023-05-31'
---
Please help us improve this description by sending us more info!
The PS/1 was IBM's return to the home computing market. It was the successor to the IBM PCjr, although it was compatible with IBM's bussines systems. The PS/1 was a propriatary system at first, but standard components were used later on. The later models included "Rapid Resume" a standby feature.
The system uses a LPX form factor (layout). Everything was built into the motherboard and had a four expansion slots of 16bit ISA but on a riser card. The memory was 72pin simms.
For the 486SX model for example, the CPU is integrated onto the motherboard but there is a socket3 that is empty. Apparently it is possible to put in another 486 CPU and the system disables the built-in CPU, which is not possible with the 386 model.
The software was Windows 3.1 and MS-DOS 6.2 on these systems. There is a bootloader from IBM that let you select ether to boot into DOS or Windows.
**Contributors :** Nick, Leland
<table> <tr> <td></td> <td>We need more info about this console ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.</td> <td></td> </tr> </table>