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9797: The interrupt routine: no BREAK
Passes the interrupt to the ROM unless an error is pending -- BREAK, most likely -- and if one is, restarts the BASIC program instead of letting it stop.
INTERRUPT 9797 DI
9798 PUSH AF
9799 LD A,(ERR_NR) No error: the ROM's interrupt routine.
979C CP $FF
979E JR Z,RESTART_BASIC_0
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