prefix_apu.asm
chalharu_nerust/roms/apu/blargg_apu_2005.07.30/source/prefix_apu.asm
; Prefix included at the beginning of each test. Defines vectors
; and other things for custom devcart loader.
;
; Refer to apu_util.asm for APU test-specific routines:

      .include "apu_util.asm"

; Reset vector points to "reset".
; NMI points to "nmi" if defined, otherwise default_nmi.
; IRQ points to "irq" if defined, otherwise default_irq.

default_nmi:
      rti

default_irq:
      bit   $4015
      rti

; Delays for almost A milliseconds (A * 0.999009524 msec)
; Preserved: X, Y
delay_msec:

; Delays for almost 'A / 10' milliseconds (A * 0.099453968 msec)
; Preserved: X, Y
delay_01_msec:

; Variable delay. All calls include comment stating number of clocks
; used, including the setup code in the caller.
delay_yaNN:

; Print byte A to console as $hh
; Preserved: A, X, Y
debug_byte:

; Report "result" as number of beeps and code printed to console,
; then jump to forever.
report_final_result:

; Disable IRQ and NMI then loop endlessly.
forever:
