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4-20 Chapter 4, Advanced Diagnostics Program
Addendum 108431-001 (11-88) to
Manual No. 108033-003
Modem Direct Connect
The Modem Direct Connect selection verifies the
TIP/RING (two wire) loopback circuitry as well
as the data transfer and bit error rate circuitry
(as does the Modem Internal Loopback selec-
tion, above). It also verifies that the modem can
communicate with another modem. This test
is performed when two modems in different
computers are directly connected through one
telephone cable. The selection does not verify
dialing, originating, or answering.
Fixed Disk Drive
The Fixed Disk Drive test runs a series of tests
that verify the fixed disk drive, the fixed disk
drive controller, and cables. Depending on the
computer configuration, a Fixed Disk Drive
Menu may appear. The selections allow you to
run any one or all of the tests on any physical
drive.
The following selections are available:
□ Write/Read/Compare on Test Cylinder
□ Seek
□ Head Select
□ Error Detection and Correction
□ Run All the Above Tests
□ Read Verify
□ Format Menu
The following paragraphs describe these selec-
tions.
Write/Read/Compare on Test Cylinder
The Write/Read/Compare on Test Cylinder
selection writes information from memory to the
fixed disk drive on the test cylinder, reads it back,
then compares it to what is in memory.
Seek
The Seek selection performs a sequential seek
over the fixed disk drive then performs a random
seek to verify the ability of the head actuator to
find randomly selected cylinders in a predeter-
mined amount of time.