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I > IBM  > PS/1   


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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

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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

I see that the price section below is blank. My first and second computers were both IBM PS1. I recall paying about $1100-$1200 for the first one circa 1988. the second one was less expensive as the technology was no longer cutting edge. I had to start it in DOS prompt and hated when window first came out because it seemed so different.

Sunday 10th April 2016
Rose (USA)

I had two of these systems. I do not remember the models but I remember the hardware. The first one I bought from a friend for 50 bucks. It had a 486SX at 25MHz, 4MB of ram, 1.44MB floppy and a 1.2MB floppy. It also had a 1200 baud internal modem and had a beeper speaker. A few months later a random person in the neighborhood knew I was into computers and gave me their old PS$1 that was a 386. No memory, had both floppies and once again a 1200 baud modem. Later down the road I fixed them up by adding memory, CD-ROM drives and added sound cards. The 486 received a multimedia/modem card that was pulled some a Packardbell. It was basically a soundblaster with a 14.4K dial-up modem. The 386 got a Diamond monster card with a ESS sound chip. I used the systems to play games with friends via null modem. Played mostly the DOOM series. I don''t remember the hard drive sizes. I know they were the original ones but the 486 model got a new drive and I tossed the old one as a slave into the 386.

Tuesday 22nd March 2016


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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