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of816/platforms/Neon816/Neon816.s
2019-11-20 18:22:11 -08:00

41 lines
1.0 KiB
ArmAsm

.p816
.a16
.i16
.include "macros.inc"
.import _Forth_initialize
.import _Forth_ui
.import _system_interface
.pushseg
.segment "FStartup"
.proc startup
clc
xce
rep #SHORT_A|SHORT_I
lda #$0300 ; direct page for Forth
tcd
lda #.hiword($020000) ; top of dictionary memory
pha
lda #.loword($020000)
pha
lda #.hiword($010000) ; bottom of dictionary
pha
lda #.loword($010000)
pha
lda #$0300 ; first usable stack cell (relative to direct page)
pha
lda #$0100 ; last usable stack cell+1 (relative to direct page)
pha
lda #$09FF ; return stack first usable byte
pha
lda #.hiword(_system_interface)
pha
lda #.loword(_system_interface)
pha
jsl _Forth_initialize
jsl _Forth_ui
brk
.byte $00
.endproc
.popseg