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-nscsi_cd: Return mid-sector data when initiating a read mid-sector in 512-byte block mode. [Ryan Holtz]

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This commit is contained in:
mooglyguy 2018-09-16 00:24:44 +02:00
parent e317fb887f
commit ea58b128bf
2 changed files with 8 additions and 1 deletions
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3
src/devices/machine/nscsi_cd.cpp
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@ -49,6 +49,7 @@ uint8_t nscsi_cdrom_device::scsi_get_data(int id, int pos)
if(id != 2)
return nscsi_full_device::scsi_get_data(id, pos);
const int sector = (lba * bytes_per_block + pos) / bytes_per_sector;
const int extra_pos = (lba * bytes_per_block) % bytes_per_sector;
if(sector != cur_sector) {
cur_sector = sector;
if(!cdrom_read_data(cdrom, sector, sector_buffer, CD_TRACK_MODE1)) {
@ -56,7 +57,7 @@ uint8_t nscsi_cdrom_device::scsi_get_data(int id, int pos)
std::fill_n(sector_buffer, sizeof(sector_buffer), 0);
}
}
return sector_buffer[pos & (bytes_per_sector - 1)];
return sector_buffer[(pos + extra_pos) & (bytes_per_sector - 1)];
}
void nscsi_cdrom_device::return_no_cd()

6
src/mame/drivers/sun4.cpp
View File

@ -1999,11 +1999,17 @@ static void sun_floppies(device_slot_interface &device)
device.option_add("35hd", FLOPPY_35_HD);
}
static void sun4_cdrom(device_t *device)
{
downcast<nscsi_cdrom_device &>(*device).set_block_size(512);
}
static void sun_scsi_devices(device_slot_interface &device)
{
device.option_add("cdrom", NSCSI_CDROM);
device.option_add("harddisk", NSCSI_HARDDISK);
device.option_add_internal("ncr53c90a", NCR53C90A);
device.set_option_machine_config("cdrom", sun4_cdrom);
}
void sun4_state::ncr53c90a(device_t *device)