Two Stop Bits | Wanted to figure out how to develop for GEOS on the C=64. Turns out there are ra...

onre 371 days ago | parent

Wanted to figure out how to develop for GEOS on the C=64. Turns out there are rather many things called GEOS these days. However, if you're like me, this is the link you're after:

https://archive.org/details/The_Official_GEOS_Programmers_Re...

simmons 371 days ago
Very cool! I loaded it up and played around with it a bit.
Huh, I didn't know about that GEOS book back when I was a kid trying to figure out how to make GEOS programs. I wrote a letter to Berkeley Softworks asking for information about how one could develop GEOS programs, and I guess someone felt sorry for me because they sent me a huge binder with a printed version of the Hitchhiker's Guide to GEOS:
https://www.lyonlabs.org/commodore/onrequest/geos/geos-manua...
I still have it today. Needless to say, as a kid, I had a great time reading it, making programs, and learning lots of new things. :)
- onre 371 days ago
  My C=64 childhood consisted of BASIC, Simons' BASIC and a Finnish translation of this:
  https://www.computinghistory.org.uk/det/32184/Commodore%2064.../
  Trying things out without any preconceptions of how programming should work was quite an adventure.
Darkstar 371 days ago
I like the kind of funny way this was written back then, you wont see things like this in any current (official/printed) developer documentation:
```
  Panic - Roll Over and Die
  ...
  (Registers) destroyed: a, x, y, r0-r15, and probably much, much more
```