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are properly inserted into the IC sockets.
are no pins outside the sockets and that there are no pins
bent under the IC'
P 9 .
Configure the RAM board with all the address switches OFF.
Install the RAM board in the computer and then turn on the
power and depress and release the reset switch.
should NOT'be lit.
locate the problem before proceeding.
P10. Select an unused address region in your computer and
configure the address switches on the RAM board for that
region.
Plug the board in and turn on the computer power.
Do not execute any software which initializes the RAM board.
[E.g., the HORIZON DOS will initialize all RAM in the
computer.
To bypass this, boot up with only 8K of the board
(addressed at 2000H) turned ON, and turn on the other 8K
after boot load.] Next, examine cells in the address region
of the memory board using a monitor program or control
panel.
Eventually, you will examine a cell which powered up
with a parity error.
light.
Now turn off the computer power.
light, then locate and correct the problem before
continuing.
Pll. Power up the computer with the RAM-16-A board installed in
the motherboard.
DOS initialization to store into each byte on the board, to
clear all incorrect parity bytes.
detection by executing the two instructions shown in the
previous step.
momentarily during this sequence:
the arming instruction is executed.)
possible to turn on the LED by examining cells on the RAM
board.
If the LED does turn on, then either the memory is
making errors or there is a problem with the parity option.
Locate and correct the problem before continuing.
The parity option is now assembled and checked out.
21
.
s
If it is, turn off the computer and
When this occurs, the LED should
Use a program such as the standard HORIZON
(It is normal for the LED to turn on
North Star 16K RAM BOARD
Check that there
The LED
If the LED did not
Again, enable the parity
it should turn off when
It should not now be
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