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27042: Delete character
Used by the routine at KEYBOARD_HANDLER.
DELETE_PRESSED 27042 LD A,D
27043 CP L Have we reached start of buffer?
27044 JR Z,KEYBOARD_HANDLER_0 If so, back to waiting for a key
27046 DEC L Move to previous buffer position
27047 PUSH HL
27048 CALL BEEP_ON_KEYPRESS Call 'beep on keypress'
27051 LD HL,27190 HL=Backspace flashing cursor
27054 JR KEYBOARD_HANDLER_3 Display cursor and get another character
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