2021-07-30 04:07:55 +00:00
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.p816
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2019-12-05 05:18:42 +00:00
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.a16
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.i16
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.include "macros.inc"
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.include "./Neon816-hw.inc"
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.segment "ROMBOOT"
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.proc romboot
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2021-07-30 04:07:55 +00:00
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; Go full native mode
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2019-12-05 05:18:42 +00:00
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clc
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xce
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rep #SHORT_A|SHORT_I
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.a16
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.i16
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lda #$01FF
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tcs
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2021-07-30 04:07:55 +00:00
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; Set up MMU for bank 0 - map all but the top 4K to bank $80,
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; leaving the top (MMU) page for ROM
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2019-12-05 05:18:42 +00:00
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ldx #$001C
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lda #$8000
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: sta f:NeonMMU,x
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dex
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dex
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bpl :-
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2021-07-30 04:07:55 +00:00
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jml f:Neon_ROM ; assume main firmware starts at $200000
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2019-12-05 05:18:42 +00:00
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.endproc
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.segment "VECTORS"
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.proc vectors
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; native mode vectors
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.word $FFFF ; FFE0 - reserved
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.word $FFFF ; FFE2 - reserved
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.word $FFFF ; FFE4 - COP
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2021-07-30 04:07:55 +00:00
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.word .loword(romboot) ; FFE6 - BRK - handle like reset for now
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2019-12-05 05:18:42 +00:00
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.word $FFFF ; FFE8 - ABORT
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.word $FFFF ; FFEA - NMI
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.word $FFFF ; FFEC - reserved
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.word $FFFF ; FFEE - IRQ
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; emulation mode vectors
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.word $FFFF ; FFF0 - reserved
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.word $FFFF ; FFF2 - reserved
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.word $FFFF ; FFF4 - COP
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.word $FFFF ; FFF6 - reserved
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.word $FFFF ; FFF8 - ABORT
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.word $FFFF ; FFFA - NMI
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.word .loword(romboot) ; FFFC - RESET
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2021-07-30 04:07:55 +00:00
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.word .loword(romboot) ; FFFE - IRQ/BRK - handle like reset for now
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2019-12-05 05:18:42 +00:00
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.endproc
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