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Fixed CD-ROM timings on the NCR 53x8xx SCSI controllers, the IDE_TIME, CDROM_TIME, and ZIP_TIME values, and the delay added to the CD-ROM READ SUBCHANNEL command, fixes slowdowns on several games that use CD Audio, such as Tomb Raider II.

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OBattler
2019-11-19 04:35:54 +01:00
parent 841a1f67da
commit e4408bc84d
7 changed files with 97 additions and 58 deletions
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18
src/scsi/scsi_cdrom.c
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@@ -9,7 +9,7 @@
* Implementation of the CD-ROM drive with SCSI(-like)
* commands, for both ATAPI and SCSI usage.
*
* Version: @(#)scsi_cdrom.c 1.0.71 2019/09/26
* Version: @(#)scsi_cdrom.c 1.0.72 2019/11/19
*
* Author: Miran Grca, <mgrca8@gmail.com>
*
@@ -604,15 +604,19 @@ scsi_cdrom_update_request_length(scsi_cdrom_t *dev, int len, int block_len)
static double
scsi_cdrom_bus_speed(scsi_cdrom_t *dev)
{
double ret = -1.0;
if (dev->drv->bus_type == CDROM_BUS_SCSI) {
dev->callback = -1.0; /* Speed depends on SCSI controller */
return 0.0;
} else {
/* TODO: Get the actual selected speed from IDE. */
if (scsi_cdrom_current_mode(dev) == 2)
return 66666666.666666666666666; /* 66 MB/s MDMA-2 speed */
else
return 8333333.333333333333333; /* 8.3 MB/s PIO-2 speed */
if (dev && dev->drv)
ret = ide_atapi_get_period(dev->drv->ide_channel);
if (ret == -1.0) {
dev->callback = -1.0;
return 0.0;
} else
return ret * 1000000.0;
}
}
@@ -663,7 +667,7 @@ scsi_cdrom_command_common(scsi_cdrom_t *dev)
case 0xb9:
case 0xbe:
if (dev->current_cdb[0] == 0x42)
dev->callback += 200.0 * CDROM_TIME;
dev->callback += 40.0;
/* Account for seek time. */
bytes_per_second = 176.0 * 1024.0;
bytes_per_second *= (double) dev->drv->cur_speed;