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stvcd: Be a little more robust to not having any cdrom reader

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This commit is contained in:
Olivier Galibert 2022-04-04 13:15:15 +02:00
parent 945cb29e74
commit fd8ba554a4
1 changed files with 16 additions and 1 deletions
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17
src/devices/machine/stvcd.cpp
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@ -498,7 +498,14 @@ int stvcd_device::sega_cdrom_get_adr_control(cdrom_file *file, int track)
void stvcd_device::cr_standard_return(uint16_t cur_status)
{
if ((cd_stat & 0x0f00) == CD_STAT_SEEK)
if (!cdrom)
{
cr1 = cur_status;
cr2 = 0;
cr3 = 0;
cr4 = 0;
}
else if ((cd_stat & 0x0f00) == CD_STAT_SEEK)
{
/* During seek state, values returned are from the target position */
uint8_t seek_track = cdrom->get_track(cd_fad_seek-150);
@ -1912,6 +1919,11 @@ void stvcd_device::cd_exec_command()
1)
logerror("Command exec %04x %04x %04x %04x %04x (stat %04x)\n", hirqreg, cr1, cr2, cr3, cr4, cd_stat);
if(!cdrom && ((cr1 >> 8) & 0xff) != 0x00) {
hirqreg |= (CMOK);
return;
}
switch ((cr1 >> 8) & 0xff)
{
case 0x00: cmd_get_status(); break;
@ -2000,6 +2012,9 @@ TIMER_DEVICE_CALLBACK_MEMBER( stvcd_device::stv_sh1_sim )
TIMER_DEVICE_CALLBACK_MEMBER( stvcd_device::stv_sector_cb )
{
if(!cdrom)
return;
//m_sector_timer->reset();
//popmessage("%08x %08x %d %d",cd_curfad,fadstoplay,cmd_pending,cd_speed);