HP Vectra Reference Manual page 155

Printer Control Register (X7A to X7E)
This register controls the printer signals.
~
Bit Data Definition
a
1 Generates an active high STROBE signal for a
minimum of 5aanS. The STROBE signal clocks the
data from the parallel port into the printer. The valid
data must be present a minimum of a.5uS before
and after the STROBE signal.
a
STROBE inactive.
1
Generates the AUTO FD signal.
a AUTO FD inactive.
2
a Generates the -INIT signal for a minimum of 5auS.
1
-INIT inactive.
3 1
Generates the - SLCT IN signal.
a SLCT IN inactive.
~
4
Enables the IRQ when the - ACK input signal
changes from true to false.
a Disable IRQ.
5-7 a Always.
. 138 Serial/Parallel Card