Routines
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60121: Get the ASCII code of the last key pressed
Used by the routines at 24951, 31126, 60082, 61630 and 61923. Returns with the zero flag set if no key with an ASCII code in the range 48-127 was pressed. Otherwise returns with A holding the ASCII code of the last key pressed.
60121 LD HL,23611 Point HL at the system variable FLAGS
60124 BIT 5,(HL) Check the keypress flag
60126 RES 5,(HL) Reset the flag ready for the next keypress
60128 RET Z Return if no key was pressed
60129 LD A,(23560) Collect the ASCII code of the key last pressed
60132 CP 48 Is the ASCII code < 48 ('0')?
60134 JR C,60139 Jump if so
60136 CP 128 Is the ASCII code < 128?
60138 RET C Return if so
60139 XOR A Set the zero flag to indicate that no (relevant) key was pressed
60140 RET
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