mirror of
https://github.com/mgcaret/of816.git
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80 lines
2.1 KiB
ArmAsm
80 lines
2.1 KiB
ArmAsm
.p816
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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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.import _Forth_initialize
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.import _Forth_ui
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.import _system_interface
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; Bank Map from FB posting by Lenore:
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; 00 Bank Mapper (16 blocks of 4k each, configured via MMU)
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; 08-0F Bus Controller Peripherals
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; - 08 0000-003F MMU
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; -- 00: 0-3 Unused, 4-7: Upper RAM bits
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; -- 01: Bank
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; - 09 FDC
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; 10-1F Internal Bus Bridge
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; 20-27 Flash ROM
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; 28-3F Reserved for Flash
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; 30-3F Reserved for Expansion Flash
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; 40-47 Video RAM
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; 48-7F Reserved for VRAM
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; 80-87 RAM 1
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; 88-8F RAM 2
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; 90-FF Reserved for RAM
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.pushseg
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.segment "FStartup"
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.proc startup
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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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; MMU setup, maybe. Found at page $FF in Neon bank 0
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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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; NeonFORTH does this, presumably to initialize the serial port
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sep #SHORT_A ; not necessary unless we were already native & long
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.a8
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lda #$8D
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sta f:SERctrlA
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lda #$06
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sta f:SERctrlB
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lda #$00
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sta f:SERctrlC
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rep #SHORT_A|SHORT_I
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.a16
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.i16
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lda #$0000 ; direct page for Forth
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tcd
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lda #.hiword($0A0000) ; top of dictionary memory
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pha
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lda #.loword($0A0000)
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pha
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lda #.hiword($090000) ; bottom of dictionary
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pha
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lda #.loword($090000)
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pha
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lda #$0200 ; first usable stack cell (relative to direct page)
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pha
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lda #$0100 ; last usable stack cell+1 (relative to direct page)
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pha
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lda #$03FF ; return stack first usable byte
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pha
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lda #.hiword(_system_interface)
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pha
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lda #.loword(_system_interface)
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pha
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jsl _Forth_initialize
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jsl _Forth_ui
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brk
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.byte $00
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.endproc
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.popseg
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