$D7/215:   Screen value of current Input Character/Last Character Output

Kernal-Reference:

 ASL $D7     : $E642
 BIT $D7     : $E644
 CPX $D7     : $F9E4
 EOR $D7     : $FC45
 LDA $D7     : $E67A $E723 $FC39
 LSR $D7     : $FA04
 STA $D7     : $E63E $E674 $E717 $FC47
 STX $D7     : $F9AA $FC20

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