Genesis Software Development Manual [Version 2.0] [1991-07-09]

Were you on Windows? I think the Windows version is the original and most up to date. I do remember the Linux version was lacking a few commands that were present on the Windows dev kit. Anyway, let us know if you do anything cool

Edit: Sorry I missed your question about the Code Monkeys - They were based out of the UK, more on them can be found here.