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CS423x: Change Control Indirect Address reserved bit readout for VS440FX BIOS

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RichardG867 2025-01-18 10:59:35 -03:00
parent 5e12d46f32
commit 351390b579
1 changed files with 8 additions and 1 deletions
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9
src/sound/snd_cs423x.c
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@ -147,12 +147,19 @@ cs423x_read(uint16_t addr, void *priv)
ret |= 0x04;
break;
case 3: /* Control Indirect Access Register */
/* Intel VS440FX BIOS tells CS4236 from CS4232 through the upper bits. Setting them is enough. */
ret |= 0xf0;
break;
case 4: /* Control Indirect Data Register */
ret = dev->indirect_regs[dev->regs[3]];
break;
case 5: /* Control/RAM Access */
/* Reading RAM is undocumented; the Windows drivers do so. */
/* Reading RAM is undocumented, but performed by:
- Windows drivers (unknown purpose)
- Intel VS440FX BIOS (PnP ROM checksum recalculation) */
if (dev->ram_dl == 3)
ret = dev->ram_data[dev->ram_addr++];
break;