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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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I just restored an IBM PS1 2133 back into operating condition. It had a failed 129MB Maxtor hard drive. I tried to install an Apacer 128 MB solid state drive but the BIOS would only recognize it as a 27MB drive and it was not recognized as a valid drive by DOS to perform FDISK on it. So I removed a 245MB Seagate hard disk from another old 486 computer that still works and the BIOS recognizes this and the computer boots and works perfectly. If anyone has any advice on where I could find solid state drives in the 128MB range that would work with old DOS 386 and 486 machines, it is appreciated. The Apacer SSD was recognized by my Toshiba Portege running Win95 as an advanced IDE drive so that may be the problem of the older BIOS''s not recognizing the drive properly.

Saturday 26th November 2022
Stephen De Marni (Canada)

I am looking to restore an IBM PS/1 2121, as its missing all its software from HDD. But, I also want to replace the quad split screen software stored in ROM, as it is in German. Any ideas how I can replace it with an English version? Thanks

Saturday 16th July 2022
Keke (Ireland)

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)


YEAR  1990
CONTROLLERS  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
MEDIA  3.5'' Floppy disc drive + optional hard disk depending models
NUMBER OF GAMES  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
Arcade cherry
Spiral program
Atari joystick
Battle Zone
Vectrex ship
C64 maze generator
Moon Lander
Competition Pro Joystick
Atari ST bombs
Elite spaceship t-shirt
Commodore 64 prompt
Pak Pak Monster
Pixel Deer
BASIC code
Shooting gallery
3D Cubes
Pixel adventure
Vector ship

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