=> R0 = 0
<= R1 = data register contents
R2 = status register contents
This SWI reads the data and status registers taken from the printer port. The data register is either the current value on the port, or the last value written if output is enabled.
Status register bits
Bit Meaning Port pin
0 reserved
1 reserved
2 reserved
3 Error 15
4 Select 13
5 Paper error 12
6 Acknowledge 10
7 Not Busy 11
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