I don't remember the source code being available. What was available was the BIOS (that you had to customize for your hardware), the boot loader to get stuff ru

I don't remember the source code being available. What was available was the BIOS (that you had to customize for your hardware), the boot loader to get stuff running, the CBIOS that did the disk reads and a cool program that let you patch your floppy drive parameters into your system. I worked on a number of systems and getting the BIOS to work with new hardware was an amazing feeling. One of my last CP/M systems was the Zorba, it's claim to fame was the ability for it to emulate lots of different floppy formats. So you could move data from one format of a floppy to another. It was a huge win since the only other way to move data was via a serial connection. The Zorba people would exchange formats as we figured out new ones. The other cool thing "back in the day" was replacements for the Command Line Processor part of CP/M to allow some new commands to happen. Like Busybox but 40 years ago. Now get off my lawn...