PS/1 2011 UK ROM

PS/1 2011 UKThanks to a generous reader of this site, I finally got hold of the UK version of the IBM PS/1 model 2011 ROM.


IBMulator 0.8

I’ve deemed the source code stable enough to tag and release a new version with:

  • AdLib emulation
  • Faster CPU emulation (50% faster!)
  • Various bugs fixed especially in the audio subsystem

Download IBMulator 0.8

The configuration file (ibmulator.ini) has changed so if you are upgrading delete/rename the old one to recreate.

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PS/1 2133 US preloaded software

A reader of this blog has kindly donated the US version of the preloaded software for the PS/1 types 2133 and 2155 models in the Fall 1992 product line (ISA board). – Recovery floppy images – same software but as extracted files

Software included:

  • IBM DOS 5.0
  • MS Windows 3.1
  • MS Works for Windows
  • PS/1 tools
  • PS/1 welcome
  • Recovery program
  • Video drivers (CL-5410, ET-4000)
  • Prodigy
  • Promenade

Thanks Ryan!

PS/1 2133 IT preloaded software

PS/1 2133 welcome

The Windows welcome screen

I recently won an eBay auction for a PS/1 type 2133 model 451 (EMEA market, roughly equivalent to the US model S48) with a 486SX-25 (with FPU/Overdrive socket), 2MB RAM, 85MB HDD, and an integrated VLB Cirrus Logic GD-5426.

To my great surprise inside the puny hard drive I found a complete backup of the original preloaded software (which I obviously used to restore my machine to the factory conditions).

So here it is in all its glory (it’s italian software, sorry non-italian speakers…): – IBM PS/1 2133 HDD files Italian version

The same set of programs was probably used for all the other models in the same spring 1993 product line, type 2155 included. But I’m not sure about this so if you have more info please let me know.

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IBMulator 0.7

A new version of IBMulator, the PS/1 emulator, is finally ready. In version 0.7 you’ll get:

  1. Better emulation of HDD and FDD with more realistic timings.
  2. Sound FX for FDD, HDD and the system unit.
  3. Various bug fixes.


The configuration file (ibmulator.ini) has changed so, if you are upgrading, delete or rename the old one to recreate.

Continue reading

IBMulator 0.6

The realistic GUI mode

The realistic GUI mode

In this version:

  • Realistic GUI mode
  • New key bindings (for eg. Ctrl-Alt-Del and SysReq)
  • Bug fixes (Windows 3.0 now works)

The Realistic GUI mode is for the retro enthusiasts who want to truly experience the PS/1. In this mode the system is rendered in its entirety, monitor included. There are no additional buttons or controls except for the originals: volume, brightness, contrast, power, and floppy (you need to use the key bindings for any extra function.) The PS/1 model 2011 is 32 cm (12.6″) wide and 34.9 cm (13.74″) tall, so you need at least a 24″ 16:10 monitor in portrait mode (rotated) to render it at real size.

The configuration file (ibmulator.ini) has changed a lot, with a new section. Delete the old one to recreate.

Download at