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.