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Set transmitter shift register empty bit in serial LSR. Windows 3.1 no longer hangs when DOS mouse driver loaded.

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This commit is contained in:
TomW 2014-03-29 15:17:23 +00:00
commit b4bea10c06
1 changed files with 6 additions and 1 deletions
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7
src/serial.c
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@ -172,7 +172,10 @@ uint8_t serial_read(uint16_t addr, void *p)
{ {
case 0: case 0:
if (serial->lcr & 0x80 && !AMSTRADIO) if (serial->lcr & 0x80 && !AMSTRADIO)
return serial->dlab1; {
temp = serial->dlab1;
break;
}
serial->lsr &= ~1; serial->lsr &= ~1;
serial->int_status &= ~SERIAL_INT_RECEIVE; serial->int_status &= ~SERIAL_INT_RECEIVE;
@ -206,6 +209,8 @@ uint8_t serial_read(uint16_t addr, void *p)
temp = serial->mctrl; temp = serial->mctrl;
break; break;
case 5: case 5:
if (serial->lsr & 0x20)
serial->lsr |= 0x40;
serial->lsr |= 0x20; serial->lsr |= 0x20;
temp = serial->lsr; temp = serial->lsr;
if (serial->lsr & 0x1f) if (serial->lsr & 0x1f)