$C6/198:   Number of Characters in Keyboard Buffer queue

Kernal-Reference:

 CPX $C6     : $E5C0
 DEC $C6     : $E5C4
 LDA $C6     : $E5CD $F142
 LDX $C6     : $EB35
 LDY $C6     : $EB21
 STA $C6     : $F6F7
 STX $C6     : $E5F1 $EB40
 STY $C6     : $E954

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