IBM PCjr BIOS dump

IBM PCjr BIOS dump

The IBM PCjr BIOS is very well documented in the IBM PCjr Technical Reference manual (a must read for every PCjr developer).

The only problem is that navigating that code is not easy. It has all the problems from scanned books:

  • the fonts don’t look good
  • no hyper-links
  • and difficult to search

So I dumped the BIOS and started analyzing it with IDA Pro – Free version. I added some of the original comments from the Technical Reference manual, and added some comments of my own.

If can browse it using either:

Or just clone the project from github: https://github.com/ricardoquesada/bios-8088/tree/master/ibm_pcjr

This is still Work-in-Progress. I add comments in “let’s see how this portion of the BIOS work“-basis.

 

BTW, the Tandy 1000HX BIOS dump is here: https://github.com/ricardoquesada/bios-8088/tree/master/tandy_1000hx

Update: Updated links

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