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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").