Specifications

Jumper Configurations
Table A-1
Jumper Descriptions (continued).
JUMPER # DESCRIPTION
W4(A,B) Installing W4A ties the STD bus pin
INTRQ1* (previously RESERVED) to the
interrupt request 1 (IR1) on the interrupt
controller, as opposed to installing W4B,
which ties the frontplane interrupt request 1
(FP1*) to IR1. Factory default installs W4A
for STD DOS and STD ROM systems.
W4A W4B Function
IN † OUT INTRQ1* (previously RESERVED)
STD bus signal drives IR1
OUT IN FP1* frontplane signal drives IR1
W5(A,B) Install W5A when using the 8087 plug-in
module (zSBC 337) to bring the 8087 inter-
rupt request to interrupt request 0 (IR0) on
the interrupt controller. Install W5B for STD
DOS systems to bring the output of timer 0
to IR0 on the interrupt controller. Factory
default installs W5B.
W5A W5B Function
IN OUT 8087 interrupt request drives IR0
OUT IN † Timer 0 output drives IR0
A-5