furnace/doc/7-systems/pet.md

# 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.
system doc work 2022-03-22 05:58:07 +00:00			`# Commodore PET`

			`a computer from 1977 which was leader on US schools back then. subsequently the Apple II took its throne.`

More little stuff. 2023-07-01 03:25:12 +00:00			`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.`
system doc work 2022-03-22 05:58:07 +00:00
			`some of these didn't even have sound...`

			`# effects`

Lots of little cleanup. Trying for more consistency and clarity, especially for quick reference. 2023-06-25 07:05:30 +00:00			- `10xx`: set waveform. `xx` is a bitmask.