furnace/doc/7-systems/pet.md
2023-06-05 00:08:37 -05:00

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# Commodore PET
a computer from 1977 which was leader on US schools back then. subsequently the Apple II took its throne.
maybe no better than a computer terminal, but somebody discovered a way to update the screen at turbo rate - and eventually its sound "chip" (it was nothing more than an 8-bit shift register) was abused as well.
some of these didn't even have sound...
# effects
- 10xx: set waveform. `xx` is a bitmask.