Routines
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FE56: switch to interrupt mode 2
Used by the routines at main_routine, examine_board, routine06, routine13 and routine72.
set_IM2_mode FE56 LD A,$09 set I to $09 for the high byte of the interrupt vector. The lower byte is assumed to always be $FF so that the value $FE69 will be read from address $09FF in ROM
FE58 LD I,A
FE5A IM 2 set interrupt mode 2
FE5C RET return
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