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

This location points to the beginning address of the area in RAM which is currently being LOADed or SAVEd. For tape I/O, it will point to the cassette buffer, and the rest of the data is LOADed or SAVEd directly to or from RAM. This location points to the beginning address of the area of RAM to be used for the blocks of data that come after the initial header.

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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