HP 98568A Installation Instruction page 149

HP 98627 A Color Output Interface
otherwise set the interface to a combined green and sync signal by
setting option switch 1 as shown in Figure 5-23.
4. Set option switch 2.
SKIP?
If you intend to connect an HP 13279B Color Monitor to this
interface, you can skip to step 5. Option switch 2 is preset to a
24.8 kHz horizontal scan and need not be changed.
a. Set option switch 2 as follows:
• If connecting an HP 13279B Color Monitor to this interface, set option
switch 2 to 24.8 kHz horizontal scan as shown in Figure 5-23 .
• If connecting some other monitor, set option switch 2 opposite of that
shown in Figure 5-23 if the monitor has a 15.75 kHz horizontal scan;
set option switch 2 as shown in Figure 5-23 if the monitor has a 24.8
kHz scan.
5. Insert the Interface.
a. Remove the painted cover plates from the back of your computer until
you find an empty even-numbered slot. (Slots are numbered from the top
down, so the top-most slot is number 1, the next slot down is number 2,
etc.) Do not remove the silver cover plates from the bottom of a Series
300 computer.
b. Insert the Color Output Interface, component side up, into the empty
even-numbered slot. Tighten the thumb screws on the metal end plate
until the end plate is flush with the back of the computer.
c. If you changed the select code of the Color Output Interface in step
2, find this number in the set of select code labels supplied with the
interface. Affix this label to the metal end plate.
d. If you have other interface or accessory cards to install, leave the cover
plates off; otherwise, replace them.
6. Record the Select Code.
Make a note that select codes 28 and 29 (or the alternate select codes
you chose in step 2) have been used and are no longer available. Use the
Adding Interface Cards 5-53