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support Space Eggs

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This commit is contained in:
Peter Ferrie 2019-03-11 14:09:28 -07:00
parent 007456ecb2
commit cb8c82331d
2 changed files with 88 additions and 1 deletions
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1
res/notes.txt
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@ -9,4 +9,3 @@ Do not work yet:
- Star Thief (Cavalier)
$42C0: 4C 01 68 to bypass undocumented 6502 opcodes and 6502-specific JMP behavior
- Quadrant 6112 (Sensible Software)
- Space Eggs (Sirius)

88
src/idbroderbund.a
View File

@ -36,10 +36,21 @@ IDBroderbund
bcs @exit
; patch code to regain control after it loads 1 sector into $0300
lda $837
cmp #$4C
clc
bne @maybeSpaceEggs
lda #<@BroderbundCallback
sta $0838
lda #>@BroderbundCallback
sta $0839
bne @exit
@maybeSpaceEggs
lda #<@SpaceEggsCallback
sta $0842
lda #>@SpaceEggsCallback
sta $0843
@exit
rts
@ -113,6 +124,7 @@ IDBroderbund
lda #>@DMMCallback
sta $0323
jmp $0301
; TODO
@unsupported
jmp Unsupported
@ -217,3 +229,79 @@ IDBroderbund
lda #$FD ; SMC
rts
}
@SpaceEggsCallback
lda $33C
cmp #$AD
bne +
lda $3CC
cmp #$36
bne +
lda #$4C
sta $33C
lda #<@SpaceEggsCallback2
sta $33D
lda #>@SpaceEggsCallback2
sta $33E
jmp $301
@SpaceEggsCallback2
lda $37E0
cmp #$32
bne +
lda #$EA
sta $3CDC
sta $3CE0
sta $3CE1
sta $3CE7
sta $3CEB
sta $3CED
sta $3CF1
sta $3CF4
sta $3CF8
lda #<@SpaceEggsCallback3x
sta $3CFE
lda #>@SpaceEggsCallback3x
sta $3CFF
ldy #@SpaceEggsCallback3_e-@SpaceEggsCallback3
- lda @SpaceEggsCallback3-1,y
sta $300-1,y
dey
bne -
+ jmp $3700 ; let it goooo...
@SpaceEggsCallback3 !pseudopc $300 {
@SpaceEggsCallback3x
jsr $3700
pla
pla
jsr $5700
lda #$EA
sta $49C3
sta $49C4
sta $49C8
sta $49CB
sta $49CE
sta $49D2
sta $49E3
sta $49E6
sta $49ED
sta $49F1
sta $49F7
sta $4928
sta $4934
sta $493B
sta $4949
sta $494F
sta $4952
sta $495A
sta $495E
sta $4960
sta $4969
sta $496F
sta $4976
sta $497A
sta $497E
rts
}
@SpaceEggsCallback3_e