91,92



     before every operation. Used to determine the starting row for
     the DRAWTO and XIO 18 (FILL command).

91,92          5B,5C          OLDCOL
     Previous graphics cursor column. Updated from locations 85 and
     86 ($55, $56) before every operation. These locations are used by
     the DRAWTO and XIO 18 (FILL) commands to determine the
     starting column of the DRAW or FILL

93             5D             OLDCHR
     Retains the value of the character under the cursor used to
     restore that character when the cursor moves

94,95          5E,5F          OLDADR
     Retains the memory location of the current cursor location. Used
     with location 93 (above) to restore the character under the cursor
     when the cursor moves

96             60             NEWROW
     Point (row) to which DRAWTO and XIO 18 (FILL) will go.

97,98          61,62          NEWCOL
     Point (column) to which DRAWTO and XIO 18 (FILL) will go.
     NEWROW and NEWCOL are initialized to the values in
     ROWCRS and COLCRS (84 to 86; $54 to $56) above, which
     represent the destination end point of the DRAW and FILL
     functions. This is done so that ROWCRS and COLCRS can be
     altered during these routines.

99             63             LOGCOL
     Position of the cursor at the column in a logical line. A logical
     line can contain up to three physical lines, so LOGCOL can
     range between zero and 119. Used by the display handler.
  
100,101        64,65          ADRESS
     Temporary storage used by the display handler for the Display
     List address, line buffer (583 to 622; $247 to $26E), new MEMTOP
     value after DL entry, row column address, DMASK value, data to
     the right of cursor, scroll, delete, the clear screen routine and for
     the screen address memory (locations 88, 89; $58, $59).

102,103        66,67          MLTTMP
     Also called OPNTMP and TOADR; first byte used in OPEN as
     temporary storage. Also used by the display handler as
     temporary storage.

104,105        68,69          SAVADR
     Also called FRMADR. Temporary storage, used with ADRESS
     above for the data under the cursor and in moving line data on
     the screen.