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3.5.3
Software Instructions
The following instructions indicate how to arm and
disarm parity checking. This example assumes that bit
6 has been selected.
MVI A,41H
OUT 0C0H
MVI A,40H
OUT 0C0H
Note
condition on or off. If you choose a different I/O
bit, change the program instructions accordingly. If
you move the mini-jump in JP1 to select bit 5 instead
of bit 6, the operands should change from 41H and 40H
to 21H and 20H. If you select bit 7, the operands
should change from 41H and 40H to 81H and 80H.
3.6
BOARD AND SCHEMATIC REVISION LEVELS
To determine the revision level of the HRAM board,
look on the board for jumper area JP4 shown in Figure
3-2. Revision E boards have this jumper area but
revision B boards do not.
The revision A schematic corresponds to the revision B
board and the revision C schematic corresponds to the
revision D board.
HRAM
JP3 Set to Disable Parity Error Interrupts
; Clear any previous parity errors and
; arm parity interrupts
; Clear any previous parity errors and
; disarm parity interrupts
that
bit
0
is
Figure 3-14
used
to
specify
USER/TECHNICAL MANUAL
turning
the
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