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Ok, thanks. Managed to handle arrows using zx+ extended codes (CSpect's "basic" mode). Observed a strange behaviour though: if I press say "up" and, while keeping it down, press "left", then release only "left" ("up" stays pressed) - seems like both bits for "5" and "7" are back to "released" (high) state instead of just "5". Works as expected on the hardware.

Hi, just making sure - the Next $b0 & $b1 (extended keys) registers are not implemented, right? I keep getting 0 from them, also - bit 4 of $68 also seems to do nothing. Testing on the hardware it works as intended. BTW Thanks for the great work on CSpect!