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The dissembled ROM and mappings has been documented since the 80s. (Vic20, PET, 64 and 128). My references (35 years) ago were some books published by Data Bec
by rsecora 6y ago
The dissembled ROM and mappings has been documented since the 80s. (Vic20, PET, 64 and 128).
My references (35 years) ago were some books published by Data Becker GmbH.
Note also that there were basic extensions to address the limitations of CBM basic like the Simon basic cartridge.
That Simon basic was a wonder in their own. Written by a gifted teenager and extending by mapping addresses in the ROM. It was possible to write sprites and graph in basic without pokes (no ASM needed).
- beernutz 6y agoYes, Simons basic really rocked my world! So many commands and cool things to play with! Inspired me to write my own "basic" extensions and burn them to a prom to make my own cartridge. Though things were much more primitive, it was fun getting such a low level look at everything.
- pvg 6y agoRight but the disassembled commentaries are not written by the people who originally wrote the code, so if that site is to be believed the 'original' comments and source are not around for things like the kernal and other Commodore-specific bits. It seems like an odd thing not to have surfaced given that by this point we have things like OG Quickdraw and Karateka code. Edit: I missed the comment downthread that says that some of that code was released a couple of years ago.