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PROCESSOR TECHNOLOGY CORPORATION
8KRA STATIC READ/WRITE MEMORY MODULE
SECTION I
1.1
INTRODUCTION
This manual supplies the information needed to assemble, test
and use the 8KRA Static Read/Write Memory Module.
We suggest that
you first scan the entire manual before starting assembly.
Then
make sure you have all the parts and components listed in the "Parts
List" (Table 2-1) in Section II.
When assembling the module, follow
the instructions in the order given.
Should you encounter any problem during assembly, call on us
for help if necessary.
If your completed module does not work prop
erly, recheck your assembly step by step.
Most problems stem from
poor soldering, backward installed components, and/or installing the
wrong component.
Once you are satisfied that the module is correct
ly assembled, feel free to ask for our help.
1.2
GENERAL INFORMATION
1.2.1
8KRA Memory Description
The 8KRA Static Read/Write Memory Module has a capacity of
8192 eight-bit bytes and operates in a static mode.
As opposed to
dynamic memories, the 8KRA needs only one power supply and does not
require periodic refreshing.
All address and data lines are fully buffered, and extensive
noise immunity circuitry is built into the memory.
The module fea
tures switch selectable address selection which allows its starting
address to be offset in IK increments from zero to 65K.
Maximum worst case access time for the 8KRA is 520 nsec.
Thus, in any 8080 system, this memory will operate at the same speed
as any other memory with an access time between 50 and 520 nsec.
Both the access time and non-refresh features of the 8KRA mean no
computer "waiting" time is required.
The 8KRA Memory is plug-in compatible with the Altair 8800
bus.
It requires +7.5 to +10 V de at 1.9 amp (max.) operating power.
In addition, the low power memory IC 1 s used on the module can oper
ate in a low power (+1.6 to 2.5 V de at 0.9 amp max.) standby mode.
Data loss from the 8KRA during loss-of-power or power interrupt con
ditions can consequently be prevented by using two "D" size batteries
for standby power.
Provisions for easily adding this standby capa
bility are incorporated in the module design.
1.2.2
Receiving Inspection
When your module arrives, examine the shipping container for
signs of possible damage to the contents during transit.
Then in
spect the contents for damage.
(We suggest you save the shipping
materials for use in returning the module to Processor Technology
1-1
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