INITIAL TESTS
The following tests will check the construction of
your Extended Configuration Board for errors. It will
also check the mother circuit board in your Computer
for solder bridges on some of the bus lines which were
not used until now. We strongly recommend that you
perform these tests before you continue.
NOTE: To perform the following tests, you should
have only the following plug-in circuit boards in your
Computer:
CPU circuit board
Extended Configuration Board
One 16 k Memory Board set to 040 (or two 8 k
Memory Boards, one set to 8 k and the other set
to 16 k).
TEST #1
( ) Turn the Computer on. You should hear a short
beep, the display should light, and the front
panel pushbuttons should operate normally.
If you obtained the proper results, proceed to
“Test #2.”
If you did not obtain the proper results, remove
the Extended Configuration Board and repeat
this test. If you now obtain the proper results,
check the Extended Configuration Board for
solder bridges or other construction errors.
TEST #2
( ) Check the upper right corner of your CPU cir
cuit board for the presence of a jumper wire
between holes Xl and X2. If there is a jumper
wire at this location, remove it.
( ) Make sure the Extended Configuration Board is
installed. Then turn the Computer on and check
the voltage at Xl on the CPU. It should measure
5 volts DC.
If you obtained the proper voltage, proceed to
“Test #3.”
If you did not obtain the proper results, check
the mother circuit board for a solder bridge be
tween bus lines 45 and 46. Also check the in
stallation of integrated circuit U6 on the Ex
tended Configuration Board.
TEST #3
{ ) Turn the Computer on. Then enter MEM, 040,
362, and OUT. The voltage at Xl on the CPU
should go low (less than .5 volts DC). This vol
tage should go high upon reset.
If you obtained the proper results, proceed to
“Test #4.”
If you did not obtain the proper results, check
the installation of integrated circuit U6 on the
Extended Configuration Board.
TEST #4
( ) Set the eight sections of switch SWl on the
Extended Configuration Board to “0”.
( ) Turn the Computer on and enter MEM, 111,
362, and IN. The display should read 000,362.
