Memory Installation; I/O Card Installation; Self-Test Check - HP 1000 A990 Installation And Service Manual

Memory Installation
Caution
I
STATIC SENSITIVE DEVICES - To avoid damage to equipment, before
you install or remove memory cards, you must set the Battery Enable
switch to DISABLE. Also, make sure the LINE switch is set to OFF and
the ac power cord is not connected to the ac power mains. Wear an
antistatic wrist strap connected to a ground wire.
You can install from one to four memory array cards in the A990 card cage. With available
memory cards, you can install up to 32 Mbytes of memory. The A990 supports only the A900
ECC memory array cards. The memory frontplane connectors, however, are unique to the A990.
A900 memory frontplane connectors cannot be used with the A990. Table 2-2 lists the available
types of memory array cards and frontplanes.
Install the first memory array card in the slot immediately to the left of the CPU card, the second
immediately to the left of the first, and so on. Do not leave an empty backplane slot between the
CPU card and a memory array card or between any memory array cards. If you have memory
array cards of different capacities, place the largest capacity card(s) nearest the A990 CPU card.
Install the appropriate frontplane connector using one of the four supplied with your computer.
Attach the small connector of the frontplane to the CPU card and the other connector( s) to the
memory array card(s). Be sure you use a frontplane that matches the number of memory array
cards you have installed. For example, if you have installed four memory array cards, the
frontplane must have five connectors.
I/O Card Installation
Install I/O cards the same way you installed the CPU and memory cards. DMA and interrupt
priorities for I/O cards are related to their placement relative to the CPU card. The closer to the
CPU card, the higher the priority. Install all cards contiguously (no empty slots between cards).
Self-Test Check
The self-test for the processor automatically executes every time the computer is powered on. It is
recommended that you run the self-test to ensure that the CPU is operating correctly. This check
must be made with all plug-in cards installed in the computer. To verify the self-test operation,
proceed as follows:
1. Set the LINE switch to the OFF position and connect the power cord to a power outlet. If
battery backup is installed, set the Battery Enable switch to DISABLE.
2. Remove the rear cover for observation of the processor LEDs.
Installation 2-13