
Section 4 IEEE to Parallel Operation
4.7
4.6 Parallel Interface Description and Timing
As an IEEE to parallel converter, the Parallel488 controls the following signals
(designated as
out
in the following table) and responds to the signals (designated as
in
).
Pin Signal
Direction Description
1 STROBE
out After presenting a new character on the
parallel data lines (>1µs), this line is pulsed
low for >0.5 µs.
2 DATA0
out Least significant data bit 0 (high=logic "1")
3 DATA1
out Data bit 1
4 DATA2
out Data bit 2
5 DATA3
out Data bit 3
6 DATA4
out Data bit 4
7 DATA5
out Data bit 5
8 DATA6
out Data bit 6
9 DATA7
out Most significant data bit 7
10 ACKNLG
in Low input indicates the parallel device has
accepted the character.
11 BUSY
in Low input indicates the parallel device is
ready to accept a new character. The
Parallel488 will not output a character
until this line is low.
12 PE
in Out of Paper signal. Not used.
13 SLCT
in Printer Select signal. Not used.
14 /AUTO FEED
out Always high.
16 Logic GND
Signal return.
19-30 Logic GND
Signal return.
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