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0A69: THE 'PRINT A QUESTION MARK' SUBROUTINE
Used by the routine at PRINT_OUT.
The address of this routine is derived from an offset found in the control character table.
A question mark is printed whenever an attempt is made to print an unprintable code.
Input
Output
PO_QUEST 0A69 LD A,"?" The character '?'.
0A6B JR PO_ABLE Now print this character instead.
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