Bitfields for serial line status

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Bit	Description
7	timeout
6	transmit shift register empty
5	transmit holding register empty
4	break detected
3	framing error
2	parity error
1	overrun error
0	receive data ready

Note:

For COMM-DRV, if bit 7 is set, an error occurred, and may be retrieved through a separate call (see AX=8000h"COMM-DRV").