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Bitfields for printer status

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Bit Description

7

not busy

6

acknowledge

5

out of paper

4

selected

3

I/O error

2 - 1

unused

0

timeout

Note:

If both, bit 5 "out of paper" and 4 "selected" are set, the MS-DOS/ PC DOS kernel assumes that no printer is attached.
For Tandy 2000, bit 7 indicates printer-busy when set rather than clear.