$C1-$C2/193-194:   Start Address for LOAD and Cassette Write

Kernal-Reference:

 CMP ($C1),Y : $FD75 $FD7C
 LDA $C1     : $F774 $F78B $FB92
     ($C1),Y : $FD6E
 STA $C1     : $F59C $F5E4 $F7C9 $F7DB
     ($C1),Y : $FD73 $FD7A $FD81

 INC $C2     : $FD6C
 LDA $C2     : $F771 $F790 $FB8E
 LDY $C2     : $FD8A
 STA $C2     : $F5A0 $F5E8 $F7CC $F7E3 $FD6A

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