yann64andClaude Opus 5.5
b274874139
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
112 lines
4.4 KiB
Markdown
112 lines
4.4 KiB
Markdown
---
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title: IBM PS/2 Model 25
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categories:
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- Computers
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types:
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- Professional Computer
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origins:
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- U.S.A.
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years:
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- '1987'
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cpus:
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- Intel 8086
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params:
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name: PS/2 Model 25
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image: /media/museum/photos/ibm_model25_1s.jpg
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company: /companies/ibm
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company_name: IBM
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specs:
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- label: NAME
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value: PS/2 Model 25
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- label: MANUFACTURER
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value: IBM
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- label: TYPE
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value: Professional Computer
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- label: ORIGIN
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value: U.S.A.
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- label: YEAR
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value: august 1987
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- label: END OF PRODUCTION
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value: Unknown
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- label: KEYBOARD
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value: Full stroke keyboard, PS/2 type
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- label: CPU
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value: Intel 8086
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- label: SPEED
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value: 8 MHz
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- label: CO-PROCESSOR
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value: optional Intel 8087 (math co-processor)
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- label: RAM
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value: 512 KB, upgradable to 640 KB
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- label: VRAM
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value: Unknown
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- label: ROM
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value: Unknown
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- label: TEXT MODES
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value: Unknown
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- label: GRAPHIC MODES
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value: 'MCGA graphics : 640 x 480 in monochrome, 320 x 200 in 256 colours'
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- label: COLORS
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value: 262 144 colours palette
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- label: SOUND
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value: Internal PC buzzer
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- label: SIZE / WEIGHT
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value: Unknown
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- label: I/O PORTS
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value: Parallel port, 9pin serial port, 2 x ps/2 ports, 2 x internal expansion slots (8-bit)
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- label: BUILT IN MEDIA
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value: one or two 3.5'' floppy drives (720 KB each)
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- label: OS
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value: OS/2, DOS
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- label: POWER SUPPLY
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value: Built-in power supply
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- label: PRICE
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value: Unknown
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tabs:
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- photos
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forum_thread: 1151
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photos:
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- title: MODEL 25
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subtitle: ''
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text: ''
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image: /media/museum/photos/ibm_model25_1.jpg
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- title: REAR
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subtitle: ''
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text: Thanks to Brandon for this picture
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image: /media/museum/photos/ibm_ps2-m25_rear.jpg
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- title: MOTHER BOARD
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subtitle: ''
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text: Thanks to Brandon for this picture
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image: /media/museum/photos/ibm_ps2_m25_mobo.jpg
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- title: PS/2 RUNNING WINDOWS 3.0
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subtitle: ''
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text: |-
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Windows 3.0 running in high resolution with 16 shades of grey due to a VGA card installed.
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Thanks to Brandon for this picture
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image: /media/museum/photos/ibm_ps2_windows3_ss.jpg
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oc_id: 1183
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source:
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url: https://web.archive.org/web/20230608093550/http://www.old-computers.com/museum/computer.asp?c=1183
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date: '2023-06-08'
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---
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IBM was struggling in 1986 against Apple's Macintosh series, so IBM set out to create something that would defeat the Macintosh. IBM came up with a all-in-one similar to the Macintosh. However, the Model 25 & 30 were the low-end (budget) models of the PS/2 range.
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The PS/2 Model 25 became quite popular with businesses, but never made it strong with the home market.
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The PS/2 Model 25 & 30 were the only system using the MCGA (Multicolor Graphics Adapter) standard. They came with this video features built-in. MCGA offered all text and graphic modes of the CGA standard plus 640x480 monochrome and 320x200, 256 colors (out of a palette of 262,144). It announced the future VGA standard which will become much more popular.
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Model 25 & 30 were also the only PS/2 systems using an 8-bit ISA bus (like PC ATs), as opposed to other PS/2 models which used a 16 or 32 bit MCA bus.
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Thanks to **Alex Rushing** for info and picture
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Further information from **Brandon**:\
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The model 25 came in two models, a monochrome model, and a color model. The monochrome model usually is called "Type 001", the color one being "Type 004".. There never was a type 002, or 003.\
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The motherboard for the color and black and white models are exactly the same, minus some revisions on the later years. They were always surface mounted though (most of the chips anyway).\
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They are a tough machine, though when you install one in a new room, it NEEDS to let sit in the room for a couple hours, otherwise the power supply/motherboard will die.\
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While the floppy drives were 720KB, they "could" use 1.44MB drives, as long as the interface was the same.\
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They contain TWO BIOS's in them. One called the CBIOS, and the other called the ABIOS.. CBIOS is "Compatible BIOS", and is used for DOS or Windows 3.0 and under... ABIOS, or "Advanced BIOS", is used when it runs OS/2.. OS/2 is the native OS to this unit. They also had an option for a hard drive.
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<table> <tr> <td></td> <td>We need more info about this computer ! 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>
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