Parity Checking - NorthStar HORIZON Random Access Memory User Manual

3.5

PARITY CHECKING

The
detect a memory read or write error and generate a
program interrupt if an error occurs.
3.5.1 Designating I/O Port Control Bits
The HRAM uses I/O port C0H to arm and disarm parity
error interrupts. A jumper plug in area JP1 determines
which of three possible bits of the output byte will
be used to arm or disarm parity error interrupts from
the memory board to the processor.
The HRAM is shipped with the jumper plug positioned as
shown
control
configuration.
connecting pin P to pins 5 or 7 respectively (see
Figure 3-5).
HRAM
parity checking
in Figure 3-12.
bit and
Bits
JP1 Selecting I/O Control Bit 6
feature makes,
This selects
is the North
5 or 7 may
Figure 3-12
USER/TECHNICAL MANUAL
it possible
bit 6 as the
Star standard
be selected
to
by