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formats/thom_cas.cpp: Improve handling of MO5 .k7 format

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- Recognize a variant with the "DC" tag in hex rather than ASCII
- Add padding for an extended block type found in Androides
This commit is contained in:
AJR 2024-11-13 08:15:14 -05:00
parent ff4e382ca9
commit c95f345a58
1 changed files with 19 additions and 3 deletions
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22
src/lib/formats/thom_cas.cpp
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@ -58,6 +58,8 @@ static uint8_t* to7_k7_bits;
and so, is used by emulators that bypass the BIOS routine. and so, is used by emulators that bypass the BIOS routine.
It is generally hacked from the raw image more or less by hand It is generally hacked from the raw image more or less by hand
(in particular, to by-pass special loaders and copy-protection schemes). (in particular, to by-pass special loaders and copy-protection schemes).
Many of these hacks use emulator-exclusive 6809 instructions and will
not work in MAME.
As we run the original BIOS routine, we need to hack back the k7 file As we run the original BIOS routine, we need to hack back the k7 file
into the original stream. into the original stream.
@ -462,7 +464,8 @@ static cassette_image::error mo5_k5_load( cassette_image *cass )
size_t size = cass->image_size( ), pos = 0; size_t size = cass->image_size( ), pos = 0;
int i, sz, sz2, hbit = 0; int i, sz, sz2, hbit = 0;
uint8_t typ, block[264], sum; uint8_t typ, block[264], sum;
int invalid = 0, hbitsize = 0, dcmoto = 0; int invalid = 0, hbitsize = 0;
bool dcmoto = false, dcmoto_old = false;
LOG (( "mo5_k5_load: start conversion, size=%li\n", (long)size )); LOG (( "mo5_k5_load: start conversion, size=%li\n", (long)size ));
PRINT (( "mo5_k5_load: open cassette, length: %li bytes\n", (long) size )); PRINT (( "mo5_k5_load: open cassette, length: %li bytes\n", (long) size ));
@ -553,7 +556,9 @@ static cassette_image::error mo5_k5_load( cassette_image *cass )
cass->image_read( block, pos, 6 ); cass->image_read( block, pos, 6 );
if ( ! memcmp( block, "DCMOTO", 6 ) || ! memcmp( block, "DCMO5", 5 ) || ! memcmp( block, "DCMO6", 5 ) ) if ( ! memcmp( block, "DCMOTO", 6 ) || ! memcmp( block, "DCMO5", 5 ) || ! memcmp( block, "DCMO6", 5 ) )
dcmoto = 1; dcmoto = true;
if ( block[0] == 0xdc && block[1] == 0x01 )
dcmoto_old = true;
/* loop over regular blocks */ /* loop over regular blocks */
while ( pos < size ) while ( pos < size )
@ -574,6 +579,12 @@ static cassette_image::error mo5_k5_load( cassette_image *cass )
pos += 5; pos += 5;
} }
} }
else if ( dcmoto_old )
{
cass->image_read( block, pos, 1 );
if ( block[0] == 0xdc )
pos++;
}
/* skip 0x01 filler */ /* skip 0x01 filler */
for ( sz = 0; pos < size; pos++, sz++ ) for ( sz = 0; pos < size; pos++, sz++ )
@ -693,7 +704,12 @@ static cassette_image::error mo5_k5_load( cassette_image *cass )
pos -= sz; pos -= sz;
goto rebounce; goto rebounce;
} }
if ( invalid < 10 && sz > 6 && ( (in == 0x3c && in2 == 0x5a) || (in == 0xc3 && in2 == 0x5a) || (in == 0xc3 && in2 == 0x3c) || (in == 0x87 && in2 == 0x4a) ) ) if ( invalid < 10 && sz > 6 &&
( (in == 0x3c && in2 == 0x5a) ||
(in == 0xc3 && in2 == 0x5a) ||
(in == 0xc3 && in2 == 0x3c) ||
(in == 0x87 && in2 == 0x4a) ||
(in == 0x3c && in2 == 0x55) ) ) // Androïdes
{ {
/* special block found */ /* special block found */
K5_FILL_0( 1200 ); K5_FILL_0( 1200 );