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mtx.c: Improve snapshot loading

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This commit is contained in:
Dirk Best 2013-07-02 17:25:59 +00:00
parent a4f86de597
commit ed9bab35b6
2 changed files with 42 additions and 20 deletions
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2
src/mess/drivers/mtx.c
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@ -372,7 +372,7 @@ static MACHINE_CONFIG_START( mtx512, mtx_state )
MCFG_Z80CTC_ADD(Z80CTC_TAG, XTAL_4MHz, ctc_intf )
MCFG_TIMER_DRIVER_ADD_PERIODIC("z80ctc_timer", mtx_state, ctc_tick, attotime::from_hz(XTAL_4MHz/13))
MCFG_CENTRONICS_PRINTER_ADD(CENTRONICS_TAG, standard_centronics)
MCFG_SNAPSHOT_ADD("snapshot", mtx_state, mtx, "mtb", 0.5)
MCFG_SNAPSHOT_ADD("snapshot", mtx_state, mtx, "mtx", 1)
MCFG_CASSETTE_ADD("cassette", mtx_cassette_interface)
MCFG_TIMER_DRIVER_ADD_PERIODIC("cassette_timer", mtx_state, cassette_tick, attotime::from_hz(44100))

60
src/mess/machine/mtx.c
View File

@ -323,36 +323,58 @@ WRITE8_MEMBER(mtx_state::hrx_attr_w)
SNAPSHOT
***************************************************************************/
// this only works for some of the files, nothing which tries to load
// more data from tape. todo: tapes which autorun after loading
SNAPSHOT_LOAD_MEMBER( mtx_state, mtx )
{
address_space &program = m_maincpu->space(AS_PROGRAM);
void *ptr;
UINT8 header[18];
UINT16 addr;
/* get the header */
image.fread( &header, sizeof(header));
// read header
image.fread(&header, sizeof(header));
if (header[0] == 0xff)
// verify first byte
if (header[0] != 0xff)
{
/* long header */
addr = pick_integer_le(header, 16, 2);
void *ptr = program.get_write_ptr(addr);
image.fread( ptr, 599);
ptr = program.get_write_ptr(0xc000);
image.fread( ptr, snapshot_size - 599 - 18);
image.seterror(IMAGE_ERROR_INVALIDIMAGE, NULL);
return IMAGE_INIT_FAIL;
}
else
// get tape name
char tape_name[16];
memcpy(&tape_name, &header[1], 15);
tape_name[15] = '\0';
image.message("Loading '%s'", tape_name);
// start of system variables area
UINT16 system_variables_base = pick_integer_le(header, 16, 2);
// write system variables
UINT16 system_variables_size = 0;
if (system_variables_base != 0)
{
/* short header */
addr = pick_integer_le(header, 0, 2);
image.fseek(4, SEEK_SET);
void *ptr = program.get_write_ptr(addr);
image.fread( ptr, 599);
ptr = program.get_write_ptr(0xc000);
image.fread( ptr, snapshot_size - 599 - 4);
ptr = program.get_write_ptr(system_variables_base);
system_variables_size = 0xfb4b - system_variables_base;
image.fread(ptr, system_variables_size);
}
// write actual image data
UINT16 data_size = snapshot_size - 18 - system_variables_size;
ptr = program.get_write_ptr(0x4000);
image.fread(ptr, 0x4000);
// if we cross the page boundary, get a new write pointer and write the rest
if (data_size > 0x4000)
{
ptr = program.get_write_ptr(0x8000);
image.fread(ptr, 0x4000);
}
logerror("snapshot name = '%s', system_size = 0x%04x, data_size = 0x%04x\n", tape_name, system_variables_size, data_size);
return IMAGE_INIT_PASS;
}