2 ; IRQ handling (ATARI version)
5 .export initirq, doneirq
10 .import __CHARGEN_START__
11 .include "romswitch.inc"
14 ; ------------------------------------------------------------------------
28 ; ------------------------------------------------------------------------
38 ; ------------------------------------------------------------------------
52 sta PORTB ; disable ROM
53 set_chbase >__CHARGEN_START__
55 jsr callirq ; Call the functions
58 sta PORTB ; restore old ROM setting
65 jmp IRQInd ; Jump to the saved IRQ vector
67 ; ------------------------------------------------------------------------