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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
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.
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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: www.zonadepruebas.com Restaurando y vitaminando un IBM PS/1 Model 2121. Sorry for the multiple posts.
Saturday 14th May 2022
Bill Henderson (USA)
NAME
PS/1
MANUFACTURER
IBM
ORIGIN
U.S.A.
YEAR
1990
END OF PRODUCTION
1994
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.
