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Hello, I have spent the past few days cleaning up two generic CP/M 2.2 disks from Digital Research (DRI). CP/M had generic versions released by DRI to OEMs, similar to the OEM Adaptation Kits for MS-DOS. The generic version of CP/M 2.2 consisted of two disks - the Master Control disk and the...

I have created a collection of all known versions of SCP's 8086 Monitor ROM. Versions 1.4 to 1.6 are intended for the SCP CPU support board model 300F, while version 1.9 is designed for model 301A. Both the source code and binary files are included for all versions. Version 1.4 came the...

While browsing @geneb's Internet Archive uploads, I came across this weird copy of PC-DOS 1.10. It is weird because it came on an 8" disk, in CP/M format. Had that been the only anomaly, I might not have bothered mentioning it. However, what adds an extra layer of peculiarity is that it differs...

I have reached a significant milestone in my disassembly project for 86-DOS 0.11, and I am excited to create a dedicated thread for it. Some of you may remember my previous work on the DOS kernel; well, now I am pleased to announce that I have completed the full disassembly! Special thanks to...

@RichCini and I have collaborated on reconstructing the Monitor + BIOS ROM code that Microsoft used to transfer 86-DOS binaries to prototype IBM PCs in the early days of PC-compatible DOS. According to the notes written by Bob O'Rear (one of the core devs from Microsoft responsible for porting...