HP 8711C User Manual page 312

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Table 7-4. Writeable Ports
Register
Outputs B-bit data to the CentJKl thru 07 lines of the Centronics port. Cent-DO is the
least significent bit, Cent-D7 is the most significant bit. Checks Centronics status lines for:
Printer Not on Line
BUSY
ACKNOWLEDGE
1
Sets/clears the user bit according to the least significant bit of A. A least significant bit
equal to 1 sets the user bit high. A least significant bit of 0 clears the user bit.
2 Sets/clears the limit pass/fail bit according to the least sionificant bit of A. A least sianificant
bit equal to 1 sets the pass/fail bit high. A least significant bit of 0 clears the pas&l bit.
3 Outputs I-bit data to the Cent-DO thru D7 lines of the Centronics port. Cent-DO is the
least significant bit, Cent-D7 is the most significant bit. Sets the Printer-select signal high
(de-select]. Does not check Centronics status lines.
0 Outputs a byte to the serial port. The byte is output serially according to the configuration
for the serial oort.
Table 7-5. Readable Ports
Register
Reads the serial port.
I
Reads the g-bit data port Cent-DO thru D7.
Reads the user bit.
Reads the limit test pass/fail bit.
Reads the g-bit status port.
IO
I
I
DO-Cent-acknowledge
Dl-Cent-busy
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