HP 8712ET User Manual Supplement page 51

Table 3-3
Port
Register
Number
9 0
15 0
15 1
15 2
15 10
Readable Ports
Reads the serial port.
Reads the 8-bit data port Cent_D0 thru D7.
Reads the user bit.
Reads the limit test pass/fail bit.
Reads the 8-bit status port.
D0 — Cent_acknowledge
D1 — Cent_busy
D2 — Cent_out_of_paper
D3 — Cent_on_line
D4 — Cent_printer_err
Automating Measurements
Description
Operator Interaction
Analyzer Port Numbers
3-23