Security code: Difference between revisions
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From the official SNK doc : | From the official SNK doc : | ||
< | <syntaxhighlight> | ||
dc.w 07600H, 04A6DH, 00A14H, 06600H | dc.w 07600H, 04A6DH, 00A14H, 06600H | ||
dc.w 0003CH, 0206DH, 00A04H, 03E2DH | dc.w 0003CH, 0206DH, 00A04H, 03E2DH | ||
| Line 24: | Line 24: | ||
dc.w 05888H, 051CFH, 0FFD8H, 03607H | dc.w 05888H, 051CFH, 0FFD8H, 03607H | ||
dc.w 04E75H | dc.w 04E75H | ||
</ | </syntaxhighlight> | ||
From KOF96 (CD): | From KOF96 (CD): | ||
< | <syntaxhighlight> | ||
moveq #0,d3 | moveq #0,d3 | ||
tst 2580(a5) ;$10FD14.w | tst 2580(a5) ;$10FD14.w | ||
| Line 77: | Line 77: | ||
LAB_20F6: | LAB_20F6: | ||
rts | rts | ||
</ | </syntaxhighlight> | ||
From sp-s2.sp1 : | From sp-s2.sp1 : | ||
< | <syntaxhighlight> | ||
Security: | Security: | ||
moveq #0, d3 | moveq #0, d3 | ||
| Line 136: | Line 136: | ||
locret_C1471A: | locret_C1471A: | ||
rts | rts | ||
</ | </syntaxhighlight> | ||
[[Category:Code]] | [[Category:Code]] | ||
Revision as of 12:12, 14 March 2012
Pointed to at $182 (in the 68k_program_header).
The BIOS compares this code byte per byte with its internal copy (which is located at $C146CA for SP-E, and $C146A2 for SP-E v2) as part of the cartridge detection routine.
There is some jumps to the security code inside the BIOS but it seems to never be called (at least in SP-E v2).
From the official SNK doc :
dc.w 07600H, 04A6DH, 00A14H, 06600H
dc.w 0003CH, 0206DH, 00A04H, 03E2DH
dc.w 00A08H, 013C0H, 00030H, 00001H
dc.w 03210H, 00C01H, 000FFH, 0671AH
dc.w 03028H, 00002H, 0D02DH, 00ACEH
dc.w 06610H, 03028H, 00004H, 0B02DH
dc.w 00ACFH, 00606H, 0B22DH, 00AD0H
dc.w 06708H, 05088H, 051CFH, 0FFD4H
dc.w 03607H, 04E75H, 0206DH, 00A04H
dc.w 03E2DH, 00A08H, 03210H, 0E049H
dc.w 00C01H, 000FFH, 0671AH, 03010H
dc.w 0B02DH, 00ACEH, 06612H, 03028H
dc.w 00002H, 0E048H, 0B02DH, 00ACFH
dc.w 06606H, 0B22DH, 00AD0H, 06708H
dc.w 05888H, 051CFH, 0FFD8H, 03607H
dc.w 04E75HFrom KOF96 (CD):
moveq #0,d3
tst 2580(a5) ;$10FD14.w
bne LAB_20F3 ;
movea.l 2564(a5),a0 ;$10FD04.l
move 2568(a5),d7 ;$10FD08.w
LAB_20F0:
move.b d0,EXT_03E5 ;watchdog
move (a0),d1
cmpi.b #$FF,d1
beq.s LAB_20F1 ;skip
move 2(a0),d0
cmp.b 2766(a5),d0 ;$10FDCE.b
bne.s LAB_20F1 ;skip
move 4(a0),d0
cmp.b 2767(a5),d0 ;$10FDCF.b
bne.s LAB_20F1 ;skip
cmp.b 2768(a5),d1 ;$10FDD0.b
beq.s LAB_20F2
LAB_20F1:
addq.l #8,a0
dbf d7,LAB_20F0
move d7,d3
LAB_20F2:
rts
LAB_20F3:
movea.l 2564(a5),a0 ;$10FD04.l
move 2568(a5),d7 ;$10FD08.w
LAB_20F4:
move (a0),d1
lsr #8,d1
cmpi.b #$FF,d1
beq.s LAB_20F5 ;skip
move (a0),d0
cmp.b 2766(a5),d0 ;$10FDCE.b
bne.s LAB_20F5 ;skip
move 2(a0),d0
lsr #8,d0
cmp.b 2767(a5),d0 ;$10FDCF.b
bne.s LAB_20F5 ;skip
cmp.b 2768(a5),d1 ;$10FDD0.b
beq.s LAB_20F6
LAB_20F5:
addq.l #4,a0
dbf d7,LAB_20F4
move d7,d3
LAB_20F6:
rtsFrom sp-s2.sp1 :
Security:
moveq #0, d3
tst.w 0xA14(a5)
bne.w loc_C146E6
movea.l 0xA04(a5), a0
move.w 0xA08(a5), d7
loc_C146B4:
move.b d0, (0x300001).l
move.w (a0), d1
cmpi.b #0xFF, d1
beq.s loc_C146DC
move.w 2(a0), d0
cmp.b 0xACE(a5), d0
bne.s loc_C146DC
move.w 4(a0), d0
cmp.b 0xACF(a5), d0
bne.s loc_C146DC
cmp.b 0xAD0(a5), d1
beq.s locret_C146E4
loc_C146DC:
addq.l #8, a0
dbf d7, loc_C146B4
move.w d7, d3
locret_C146E4:
rts
loc_C146E6:
movea.l 0xA04(a5), a0
move.w 0xA08(a5), d7
loc_C146EE:
move.w (a0), d1
lsr.w #8, d1
cmpi.b #0xFF, d1
beq.s loc_C14712
move.w (a0), d0
cmp.b 0xACE(a5), d0
bne.s loc_C14712
move.w 2(a0), d0
lsr.w #8, d0
cmp.b 0xACF(a5), d0
bne.s loc_C14712
cmp.b 0xAD0(a5), d1
beq.s locret_C1471A
loc_C14712:
addq.l #4, a0
dbf d7, loc_C146EE
move.w d7, d3
locret_C1471A:
rts