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indigodarkwolf / box16

A fork of the official X16 emulator, converted to C++20 and with a bunch of features tweaked and added.
MIT License
41 stars 19 forks source link

VIA IER always has bit 7 set #57

Closed Yazwh0 closed 1 year ago

Yazwh0 commented 1 year ago

Bit 7 should always be 0, according to http://archive.6502.org/datasheets/mos_6522_preliminary_nov_1977.pdf

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Yazwh0 commented 1 year ago

Datasheet was wrong. Ignore.