HP 8712ET User Manual Supplement page 81

Table 6-3
Table 6-3 shows the pin numbers, data bus bit numbers, and signal
names:
Parallel Port Pins
Pin Bit Name
1 N/A Strobe
2 D0 Data 1
3 D1 Data 2
4 D2 Data 3
5 D3 Data 4
6 D4 Data 5
7 D5 Data 6
8 D6 Data 7
9 D7 Data 8
The data will typically remain valid until the next write to the parallel
port, but you should always latch the data using the strobe.
shows a simple circuit which can be used to write to an 8-bit DAC and a
digital latch.
Automating Measurements
Controlling Peripherals
Using the Parallel Port
Figure 6-2
6-7