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3.4 TESTING & TROUBLESHOOTING
Each socket is divided into four squares. Each socket is shown as four squares
because MultiRam C can contain eight 64K auxilIary banks in its two RAM banks
(Figure 3.3). The Apple. through MultiRam C circuitry, addresses these eight
64K banks as follows:
BANK A RAM BANK B RAM
1 5
2 6
3 7
4 8
Running any of these tests, you will see a spinning cursor appear in place of
the flashing cursor in the bottom four lines of the screen. The cursor will
spin until the test Is completed.
foe will also see eight tights blink off ned on on the bottom right side of the
picture. These lights show which of the eight banks of auxiliary 64K Is being
currently tested. auxiliary banks are tested from 8 to 1 in descending order.
At the end of a test. you will see one of three markings appear in each quarter
of the sockets
— A “+“ on a black background indicates the RAM in the 64K
auxiliary memory segment, whether found on a 256K RAM chip
or a 64K RAM chip, tested good.
— An “X” on a white background indicates the RAM in the 64K
auxiliary memory segment Is probably good but can’t be
completely tested as another chip in the same group of
sockets tested bad, was missing, or was not the sane size as
the other RAM in the group.
— An empty square indicates bad RAM or missing RAM.
After a test is run, you say select the option “SHOW STATUS’ and see a summary
of usable memory (Figure 3.2). The eight banks show 64K for good RAM, 0k (zero)
if RAM is missing or bad is the bank, bank having 256k chips. where one or
more 256K chips are “partially” defective, can show 64K available is that bank.