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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.
It is generally hacked from the raw image more or less by hand
(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
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;
int i, sz, sz2, hbit = 0;
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 ));
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 );
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 */
while ( pos < size )
@ -574,6 +579,12 @@ static cassette_image::error mo5_k5_load( cassette_image *cass )
pos += 5;
}
}
else if ( dcmoto_old )
{
cass->image_read( block, pos, 1 );
if ( block[0] == 0xdc )
pos++;
}
/* skip 0x01 filler */
for ( sz = 0; pos < size; pos++, sz++ )
@ -693,7 +704,12 @@ static cassette_image::error mo5_k5_load( cassette_image *cass )
pos -= sz;
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 */
K5_FILL_0( 1200 );