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Fixed ide_get_period() to correctly use shifted mode values, fixes IDE timings.

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OBattler
2020-05-26 05:24:55 +02:00
parent 33afbe2b1d
commit b07807e9de
1 changed files with 17 additions and 17 deletions
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34
src/disk/hdc_ide.c
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@@ -182,67 +182,67 @@ ide_get_period(ide_t *ide, int size)
switch(ide->mdma_mode & 0x300) {
case 0x000: /* PIO */
switch(ide->mdma_mode & 0xff) {
case 0:
case 0x01:
period = (10.0 / 3.0);
break;
case 1:
case 0x02:
period = (20.0 / 3.83);
break;
case 2:
case 0x04:
period = (25.0 / 3.0);
break;
case 3:
case 0x08:
period = (100.0 / 9.0);
break;
case 4:
case 0x10:
period = (50.0 / 3.0);
break;
}
break;
case 0x100: /* Single Word DMA */
switch(ide->mdma_mode & 0xff) {
case 0:
case 0x01:
period = (25.0 / 12.0);
break;
case 1:
case 0x02:
period = (25.0 / 6.0);
break;
case 2:
case 0x04:
period = (25.0 / 3.0);
break;
}
break;
case 0x200: /* Multiword DMA */
switch(ide->mdma_mode & 0xff) {
case 0:
case 0x01:
period = (25.0 / 6.0);
break;
case 1:
case 0x02:
period = (40.0 / 3.0);
break;
case 2:
case 0x04:
period = (50.0 / 3.0);
break;
}
break;
case 0x300: /* Ultra DMA */
switch(ide->mdma_mode & 0xff) {
case 0:
case 0x01:
period = (50.0 / 3.0);
break;
case 1:
case 0x02:
period = 25.0;
break;
case 2:
case 0x04:
period = (100.0 / 3.0);
break;
case 3:
case 0x08:
period = (400.0 / 9.0);
break;
case 4:
case 0x10:
period = (200.0 / 3.0);
break;
case 5:
case 0x20:
period = 100.0;
break;
}