80486DX2-66/86Box-fork
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Only bits 4 to 2 of LSR are now writable, and only in loopback mode.

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OBattler
2021-03-04 21:56:43 +01:00
parent dab4cab222
commit 87161c63dd
1 changed files with 10 additions and 8 deletions
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18
src/device/serial.c
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@@ -484,14 +484,16 @@ serial_write(uint16_t addr, uint8_t val, void *p)
} }
break; break;
case 5: case 5:
dev->lsr = val; if (dev->mctrl & 0x10) {
if (dev->lsr & 0x01) dev->lsr = (dev->lsr & 0xe3) | (val & 0x1c);
dev->int_status |= SERIAL_INT_RECEIVE; if (dev->lsr & 0x01)
if (dev->lsr & 0x1e) dev->int_status |= SERIAL_INT_RECEIVE;
dev->int_status |= SERIAL_INT_LSR; if (dev->lsr & 0x1e)
if (dev->lsr & 0x20) dev->int_status |= SERIAL_INT_LSR;
dev->int_status |= SERIAL_INT_TRANSMIT; if (dev->lsr & 0x20)
serial_update_ints(dev); dev->int_status |= SERIAL_INT_TRANSMIT;
serial_update_ints(dev);
}
break; break;
case 6: case 6:
dev->msr = val; dev->msr = val;