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I > IBM  > PS/1   


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

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Ok, so that last link didn''t work either. If you google this you will find it: Restaurando y vitaminando un IBM PS/1 Model 2121. Sorry for the multiple posts.

Saturday 14th May 2022
Bill Henderson (USA)

I''m running an IBM PS/1 2121 now. I upgraded to a 486SX-33 as described at$59$t$6184$sid$078a4ebc32f203e564c4e16dca108a4b$_x_tr_sl$es$_x_tr_tl$en$_x_tr_hl$en$_x_tr_pto$wapp. In addition to this, I was able to improve performance by using the utility at$56580. My command line to enable caching is: cyrix.exe -f -b -xA000,64 dram 1300 (the -xA000,64 excludes video memory from caching, which was necessary for me to avoid graphical glitches). I was able to see a decent increase in performance by enabling cache.

Saturday 14th May 2022
Bill Henderson (USA)

My IBM PS/1 came with 8MB of ram using 30 pin simms, it also came with OS/2 2.0 where I could launch Windows 3.1 inside of it for some extreme slow fun. I want to say the price was closer to 2k near the end of 93.

Eventually upgraded the 483dx 33 to a amd/cyrix processor, upgraded the motherboard and the ram to 20MB 72pin, added a 28.8 and lots of other stuff before tossing it out

Monday 27th March 2017


TYPE  Professional Computer
YEAR  1990
KEYBOARD  full stroke keyboard with numeric keypad and function keys
CPU  Original model: Intel 80286
Later models: 386sx, 486sx, 486dx, 486dx2
SPEED  Original model: 10 MHz
Later models: from 10 MHz to 66 MHz
RAM  Original model: 512 KB (max. 1 MB)
Later models: from 1 MB to 64 MB
GRAPHIC MODES  Original model: VGA modes
Later models: sVGA modes
I/O PORTS  Parallel port, ISA slots
BUILT IN MEDIA  3.5'' Floppy disc drive + optional hard disk depending models
OS  originally PC-DOS 4.01, later IBM-DOS
POWER SUPPLY  Power supply built-in
PERIPHERALS  printer, expansion unit, hard drives, 5.25'' disk drive, etc.
PRICE  Unknown

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Ready prompt
ZX Spectrum
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Battle Zone
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Moon Lander
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Commodore 64 prompt
Pak Pak Monster
Pixel Deer
BASIC code
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Pixel adventure
Vector ship

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