$022E-$0243/558-579:   Last read/written byte for each channel

ROM-Reference:

 STA $023A  : $EB9C

 STA $023B  : $EB97

 LDA $023C  : $C98B
 STA $023C  : $C993

 STA $023D  : $C98E

 LDA $023E,X: $D3A6 $E965
 STA $023E,X: $D405 $DAAF $DCAE $E162 $E969
 STA $023E,Y: $CC0A $CD68 $D3F0 $E13D

 STA $0243  : $D449 $E6DC

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