Specifications

Jumper Configurations
Table A-1
Jumper Descriptions (continued).
JUMPER # DESCRIPTION
W51,W52 Install W51 and remove W52 to bring the
8087 interrupt output (NDPINT) from
connector J7 to a PAL implemented "OR"
gate that drives the CPU non-maskable
interrupt input (NMI). Two other sources for
NMI are power-fail and STD bus non-
maskable interrupt request (NMIRQ*). Note
that power-fail causes an NMI only if jumper
W1 is installed. Removing W51 and install-
ing W52 disables the 8087 interrupt request
from generating an NMI. Factory default re-
moves W51 and installs W52.
W51 W52 Function
IN OUT 8087 interrupt causes NMIRQ*
OUT† IN † 8087 NMIRQ* disabled
A-38