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4-18 Chapter 4, Advanced Diagnostics Program
Addendum 108431-001 (11-88) to
Manual No. 108033-003
Diskette Change Line
The Diskette Change Line selection verifies
that the diskette drive change-line circuitry is
functioning properly. You may be instructed to
remove and reinsert the blank diskette that has
been formatted for diagnostics.
Format a Diskette (for diagnostic use only)
The ADVANCED DIAGNOSTICS program
requires that a diskette be formatted for each
diskette drive being tested. This utility is not
the same as the operating system FORMAT
command. A diskette formatted for diagnostics
can be used for diagnostics only, unless it is
reformatted using the operating system.
NOTE: To fully test a diskette drive, use the
highest capacity media intended for
the drive.
Monochrome Video Board
For a description of this test, see “Video Tests”
described previously.
Asynchronous Communications
Interface
The Asynchronous Communications Interface
test verifies interface data and control lines,
baud rate, internal loopback control circuitry,
external loopback circuitry (if a loopback plug is
attached), as well as clock and calendar functions
(if applicable).
NOTE: This selection tests all asynchronous
communications interfaces. Before
selecting this test, be sure you know
which device is set to COM1 and which is
set to COM2. This is necessary to deter-
mine the applicability of any messages or
error codes that may appear. For more
complete testing of an asynchronous
communications interface, attach a
loopback plug.