Working on the 2121 support in IBMulator, I started looking for any kind of information about the video interface.
According to IBM Corp., the PS/1 2121 has got a standard VGA with 256KB of memory, very much like the 2011’s one.
Actually, the chip used is the IBM 84F7985 / TI CF62011BPC. Unfortunately there’s no datasheet and information is very scarce (if you have any technical info please let me know!)
Thanks to a generous reader of this site, I finally got hold of the UK version of the IBM PS/1 model 2011 ROM.
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
The configuration file (ibmulator.ini) has changed so if you are upgrading delete/rename the old one to recreate.
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).
PS1_2133_2155_Fall92_HDD_Restore_US.zip – Recovery floppy images
PS1_2133_2155_Fall92_HDD_Files_US.zip – same software but as extracted files
- 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)
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…):
PS1_2133_2155_Spring93_HDD_Files_IT.zip – 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.
A new version of IBMulator, the PS/1 emulator, is finally ready. In version 0.7 you’ll get:
- Better emulation of HDD and FDD with more realistic timings.
- Sound FX for FDD, HDD and the system unit.
- Various bug fixes.
The configuration file (ibmulator.ini) has changed so, if you are upgrading, delete or rename the old one to recreate.
I’m launching the new HOW-TOs section with a guide about how to use a standard, cheap 1.44MB 3.5″ drive as a replacement for a broken PS/1 floppy drive, which has a non-standard interface.
Thanks paperinik77pk for the help!