$B2-$B3/178-179:   Pointer: Start Address of Tape Buffer

  Points to $033C

  Used by Jiffy-DOS: REGSAV ($B2)

   Saved, then restored by Load routine (no other usage).

Kernal-Reference:

 CMP ($B2),Y : $F7FF
 LDA ($B2),Y : $F1A9 $F56E $F573 $F57F $F588 $F739 $F757
 LDX $B2     : $F7D0
 SBC ($B2),Y : $F583 $F58C
 STA ($B2),Y : $F1F3 $F1FA $F3CE $F781 $F788 $F78D $F792 $F797 $F79C $F7AF
 STX $B2     : $FD63

 LDY $B3     : $F7D2
 STY $B3     : $FD65

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