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bogax
PostPosted: Tue Mar 15, 2022 12:49 am 
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Joined: Tue Nov 18, 2003 8:41 pm
Posts: 250
you just want to get bit 1 into bit 7?
Code:
  lda ACIA
  and #$02
  adc #$7D
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BillG
PostPosted: Tue Mar 15, 2022 4:57 am 
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Joined: Thu Mar 12, 2020 10:04 pm
Posts: 690
Location: North Tejas
Put succinctly, the object is to return bit 1 of ACIA in the N flag while preserving the register contents.
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