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Improved interleaved rom detection (Thanks Nach!)

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pagefault
2003-03-28 16:35:14 +00:00
parent fd6f0778da
commit fb35e286b5
1 changed files with 78 additions and 11 deletions
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89
zsnes/src/init.asm
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@@ -6180,21 +6180,88 @@ NEWSYM CheckROMType
mov byte[intldone],0 mov byte[intldone],0
cmp byte[romtype],1 cmp byte[romtype],1
jne .nointerlcheck je near .hirominterlcheck
mov eax,[curromsize]
imul eax,1048576
shr eax,3
shr eax,4
imul eax,[curromsize]
mov esi,[romdata] mov esi,[romdata]
add esi,7FD5h add esi,7FC0h
cmp byte[esi],21h add esi,eax
add esi,28
mov ebx,[esi]
inc esi
mov edx,[esi]
shl edx,8
add ebx,edx
inc esi
add ebx,[esi]
inc esi
mov edx,[esi]
shl edx,8
add ebx,edx
cmp ebx,0FFFFh
jne near .nointerlcheck
mov esi,[romdata]
add esi,7FC0h
add esi,eax
add esi,25
cmp byte[esi],14
jb near .nointerlcheck
mov esi,[romdata]
add esi,7FC0h
add esi,eax
add esi,21
cmp byte[esi],32
je near .interleaved
cmp byte[esi],35
je near .interleaved
cmp byte[esi],48
je near .interleaved
cmp byte[esi],50
je near .interleaved
cmp byte[esi],83
je near .interleaved
jmp .nointerlcheck
.hirominterlcheck
mov esi,[romdata]
add esi,0FFC0h
add esi,28
mov ebx,[esi]
inc esi
mov edx,[esi]
shl edx,8
add ebx,edx
inc esi
add ebx,[esi]
inc esi
mov edx,[esi]
shl edx,8
add ebx,edx
cmp ebx,0FFFFh
jne near .nointerlcheck
mov esi,[romdata]
add esi,0FFC0h
add esi,eax
add esi,25
cmp byte[esi],14
jb .nointerlcheck
mov esi,[romdata]
add esi,0FFC0h
add esi,eax
add esi,21
cmp byte[esi],33
je .interleaved je .interleaved
cmp byte[esi],92h cmp byte[esi],49
je .interleaved je .interleaved
mov eax,[romdata] cmp byte[esi],53
add eax,07FC0h
cmp dword[eax+8],'EST3'
je .interleaved je .interleaved
cmp byte[eax],'T' cmp byte[esi],50
je .nointerlcheck je .interleaved
cmp byte[esi],31h cmp byte[esi],58
jne .nointerlcheck je .interleaved
jmp .nointerlcheck
.interleaved .interleaved
cmp byte[finterleave],1 cmp byte[finterleave],1
je .doneinterl je .doneinterl