Jumper Configurations
Table A-1
Jumper Descriptions (continued).
JUMPER #
DESCRIPTION
W62
Install W62 to allow the STD bus signal
CNTRL* to be driven by the ZT 8809A
clock signal. Remove W62 to prevent the
ZT 8809A from driving CNTRL*.
The
CNTRL* signal can be driven by an external
source in the STD backplane to the interrupt
controller IR6 via an inverter, which requires
the removal of W62. This allows for an extra
interrupt request through the STD bus
backplane.
Refer to the descriptions of
jumpers W10 and W3.
Factory default
removes W62.
W62
Function
IN
CNTRL* (or INTRQ2*) STD bus
signal driven by on-board clock
OUT †
CNTRL* (or INTRQ2*) not driven
by the ZT 8809A
Note: CNTRL* has been redefined as INTRQ2* by the STD-80
Series Bus Specification Revision 2.3. If you are using the signal as
an interrupt input to the ZT 8809A, remove W62.
A-47
