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The address of this routine is derived from an offset found in the control character table.
The current column value is manipulated and the A register set to hold 0 (for TAB 0) or 16 (for TAB 16).
PO_COMMA 02655 CALL PO_FETCH Why again?
02658 LD A,C Current column number.
02659 DEC A Move rightwards by two columns and then test.
02660 DEC A
02661 AND 16 The A register will be 0 or 16.
02663 JR PO_FILL Exit via PO_FILL.
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