Setting the Data Jumpers.
1. Refer to Figure 10-1 and find the DOUT CLEAR and BURST jumpers.
2. Install or remove the jumpers on your HP 98622A GPIO card as required by
the peripheral it will be connected to. Refer to the peripheral's manuals for
this information .
• DOUT CLEAR Jumper.
With the jumper installed, both data output registers are cleared at power
up and after an interface reset. With the jumper removed, contents of the
register are undefined. The card is shipped without the jumper. If you
intend to use the HP 9884A Paper Tape Punch with this interface, the
jumper should be in .
• BURST Jumper.
With the jumper installed, there is better overall system performance,
but slightly slower GPIO performance on high-speed transfers. With the
removed, there is slightly degraded overall system performance, but better
GPIO performance for transfers greater than lOOK transfers/second. The
card is shipped with the jumper. If you intend to use the HP 9884A
Paper Tape Punch with this interface, the jumper should be removed.
Adjusting the PCTL Delay.
Adjust the PCTL Delay if required. The PCTL line
has a built in delay of 250ns. Capacitor C6 and resistor Rl can be changed to
adjust the delay:
• To increase the delay, increase the value of C6 40pF per lOOns of additional
• To decrease the delay, decrease the value of Rl 1.47k ohms per lOOns of
Reinstalling the GPIO Card
Insert the GPIO Interface, component side up, into its slot. Tighten the thumb
screws on the metal end plate until the end plate is flush with the back of the