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I'm also a 60+ year old programmer (let's make that 60++), but I'm not clear what you are asking. I was quite proud of a Forth-like language I wrote using CP/M

I'm also a 60+ year old programmer (let's make that 60++), but I'm not clear what you are asking. I was quite proud of a Forth-like language I wrote using CP/M (Wordstar, assembler) back round about 1980 - but once it was loaded into memory (via CP/M) it didn't use CP/M BDOS at all, system calls or trap instructions.

zh3 5y ago
That's interesting, how did you do I/O? Bypassing the OS was a lot easier back then :)
- zabzonk 5y ago
  Direct memory access, BIOS (such as it was). I was actually toying with a version that would be fully CP/M hosted, so that it could read and write CP/M files but then I got a proper paying programming job - previously I was a microbiologist, moonlighting, and who could resist the delights of a DecSystem10? And then an IBM 4381?