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PROCESSOR TECHNOLOGY CORPORATION
8KRA STATIC READ/WRITE MEMORY MODULE
SECTION II
( ) Step 17 .
Check regulator operation.
This check is made to
prevent potential subsequent damage to the IC ' s from incor
rect voltages.
( X Install 8KRA in computer.
(The use of a Processor Tech
nology EXB Extender Board is recommended. )
CAUTION
NEVER INSTALL OR REMOVE CIRCUIT BOARD
WITH POWER ON.
TO DO SO CAN DAMAGE
THE BOARD.
Turn power on and measure the voltage between ground and
each of the +5 V pins of the Molex connector ( se^ Figure
2-3 on Page 11-10).
You should measure +5 V de -5% in
each case.
£X) If either voltage is incorrect, determine and correct
the cause before proceeding.
Especially check for sol
der shorts .
If voltages are correct, turn power off,
from computer, and go on to Step 18.
remove module
(X Step 18 .
Install the following IC s in the indicated loca
tions.
Pay careful attention to the proper orientation.
NOTE
Pin 1 is
PC Board
IC NO
JX IC69
X-7 IC70
XT ic7i
IC72
f~WC73
IC74
JXTIC75
(X"lC76
5X) IC77
W IC78
LX IC79
indicated by a dot on the
and assembly drawing.
TYPE
74LS138
743^283
*QT98)or
809
8-
75LS136
74LS283
74LS13
74LS109 (not supplied)
74LS132
74LS132
8T^8>Br
-8
098 '
8T93
74LS04
*This IC, the "wait state counter", is not required since
the 8KRA runs at maximum speed.
IC73 is consequently not
supplied with your kit.
For special applications, a
74LS109 can be used in this location.
11-12
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