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Fallback to old MPU behaviour on SB cards. Fixes SB16/AWE32 initialisation on

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Windows 3.1.
This commit is contained in:
SarahW 2020-04-11 14:47:19 +01:00
commit 5e437fc736
4 changed files with 22 additions and 9 deletions
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21
src/sound_mpu401_uart.c
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@ -31,16 +31,26 @@ static void mpu401_uart_write(uint16_t addr, uint8_t val, void *p)
// But actual behaviour is weird. For example, the MPU401 port test in the AZT1605 drivers for Windows NT
// want this to return an Ack but the IRQ test in the same driver wants this to raise no interrupts!
mpu->rx_data = 0xfe; /*Acknowledge*/
mpu->status = STATUS_OUTPUT_NOT_READY;
mpu->uart_mode = 0;
//mpu401_uart_raise_irq(p);
if (mpu->is_aztech)
mpu->status = STATUS_OUTPUT_NOT_READY;
else
{
mpu->status = 0;
mpu401_uart_raise_irq(p);
}
break;
case 0x3f: /*Enter UART mode*/
mpu->rx_data = 0xfe; /*Acknowledge*/
mpu->status = STATUS_OUTPUT_NOT_READY;
mpu->uart_mode = 1;
mpu401_uart_raise_irq(p);
if (mpu->is_aztech)
{
mpu->status = STATUS_OUTPUT_NOT_READY;
mpu401_uart_raise_irq(p);
}
else
mpu->status = 0;
break;
}
return;
@ -63,12 +73,13 @@ static uint8_t mpu401_uart_read(uint16_t addr, void *p)
return mpu->rx_data;
}
void mpu401_uart_init(mpu401_uart_t *mpu, uint16_t addr, int irq)
void mpu401_uart_init(mpu401_uart_t *mpu, uint16_t addr, int irq, int is_aztech)
{
mpu->status = STATUS_INPUT_NOT_READY;
mpu->uart_mode = 0;
mpu->addr = addr;
mpu->irq = irq;
mpu->is_aztech = is_aztech;
io_sethandler(addr, 0x0002, mpu401_uart_read, NULL, NULL, mpu401_uart_write, NULL, NULL, mpu);
}