6502.org

Posted: **Tue Mar 15, 2022 12:49 am**

you just want to get bit 1 into bit 7?

  lda ACIA
  and #$02
  adc #$7D

Posted: **Tue Mar 15, 2022 4:57 am**

Put succinctly, the object is to return bit 1 of ACIA in the N flag while preserving the register contents.

Attention code golfers...