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https://github.com/MiSTer-devel/CDi_MiSTer.git
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168 lines
2.6 KiB
NASM
168 lines
2.6 KiB
NASM
section .text
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org $400000
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vector:
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dc.l $1234
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dc.l main
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main:
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; Make a pause at the start to relax the UART on the linux side
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move #40000,d0
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start_delay:
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add #-1,d0
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bne start_delay
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move.l #slaveirq,$68
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move.b #2,$80001001 ; LIR
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move #$2000,SR
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move.b #$86,$310000
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move.b #$89,$310000
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move.b #$80,$310006
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move.b #$60,$310006
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move.b #$73,$310006
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move.b #$50,$310006
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move.b #$81,$310006
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move.b #$6f,$310006
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move.b #$7f,$310006
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move.b #$00,$310006
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move.b #$f2,$310004
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move.b #$09,$310002
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move.b #$21,$310002
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move.b #$40,$310002
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move.b #$24,$310002
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move.b #$0f,$310002
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move.b #$21,$310002
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move.b #$39,$310002
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move.b #$00,$310002
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;Request NTSC/PAL Status (0xf6)
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move.b #$f6,$310006
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move #4000,d0
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bsr wait
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move.b $310000,d0
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move.b $310000,d0
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move.b $310000,d0
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move.b $310002,d0
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move.b $310002,d0
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move.b $310002,d0
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move.b $310004,d0
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move.b $310004,d0
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move.b $310004,d0
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move.b $310004,d0
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;X-Bus Interrupt Enable (0xfa)
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move.b #$fa,$310006
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; Request Disc Status (0xb0)
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move.b #$b0,$310006
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move.b #$00,$310006
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move.b #$00,$310006
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move.b #$00,$310006
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move.b #$83,$310000
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move.b #$f8,$310006
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move.b #$fc,$310006
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move #4000,d0
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bsr wait
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;move #8000,d0
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;bsr wait
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move.b #$fc,$310006
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move.b #$fd,$310006
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; Request Pointer Type (0xf3)
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move.b #$f3,$310006
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move #4000,d0
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bsr wait
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move.b $310000,d0
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move.b $310000,d0
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move.b $310000,d0
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move.b $310002,d0
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move.b $310002,d0
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move.b $310002,d0
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move.b $310004,d0
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move.b $310004,d0
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move.b $310004,d0
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move.b #$f9,$310006
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move.b #$f8,$310006
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; Request Test Plug Status (0xf4)
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move.b #$f4,$310006
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move #4000,d0
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bsr wait
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move.b $310000,d0
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move.b $310000,d0
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move.b $310000,d0
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move.b $310002,d0
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move.b $310002,d0
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move.b $310002,d0
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move.b $310004,d0
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move.b $310004,d0
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move.b $310004,d0
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move.b #$f9,$310006
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move.b #$f8,$310006
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move.b #$8c,$310004
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; Activate Front LCD Buttons
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move.b #$8d,$310004
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; Request SLAVE Revision (0xf0)
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move.b #$f0,$310006
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move #4000,d0
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bsr wait
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move.b $310000,d0
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move.b $310000,d0
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move.b $310000,d0
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move.b $310002,d0
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move.b $310002,d0
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move.b $310002,d0
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move.b $310004,d0
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move.b $310004,d0
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move.b $310004,d0
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; Activate Input Polling (0xf7)
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move.b #$f7,$310006
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endless:
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bra endless
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wait:
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add #-1,d0
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bne wait
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rts
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slaveirq:
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move.b $310001,d0
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move.b $310001,d0
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move.b $310001,d0
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move.b $310001,d0
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move.b $310003,d0
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move.b $310003,d0
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move.b $310003,d0
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move.b $310003,d0
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move.b $310005,d0
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move.b $310005,d0
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move.b $310005,d0
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move.b $310005,d0
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move.b $310007,d0
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move.b $310007,d0
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move.b $310007,d0
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move.b $310007,d0
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rte
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