Resident Diagnostics; Test 1 (Quicklook); Test 2, Ram Test; Test 3, Crt Alignment, Touchpanel, Rom, Led, And Keyboard Tests - Control Data Corporation CDC CC63X Hardware Maintenance Manual

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RESIDENT DIAGNOSTICS
The resident diagnostics contain three terminal self-testing
routines, listed as follows:
• Test 1 (Quicklook)
• Test 2, RAM test
• Test 3, CRT alignment, touchpanel, ROM, LED, and keyboard
tests
Test 1 runs without operator intervention whenever the POWER or
RESET switch is pressed. Test 2 also runs without operator
intervention and is initiated upon receiving the Initial Test
Command from the host while running in CYBER mode. It can also
be initiated from the keyboard. Test 3 diagnostic routines
require operator intervention and are described in this section.
Refer to procedure 2 in section 6B for the initiation, execution
and termination for each resident diagnostic.
Test 1 (Quicklook)
Test 1 checks the overall. operation of the terminal. It checks
the microprocessor, the program memory, communications element,
the programmable timer, and the audible alarm. The test does not
display the status of its testing unless a failure occurs. The
test consists of the following sections:
• Character RAM Test - A 55 hexadecimal and an AA hexa-
decimal is written, read and compared throughout the RAM
character generator memory. A failure of this test will
display CHARACTER RAM FAIL on the next line of the CRT.
• RAM Test - A 55 hexadecimal and a AA hexadecimal is
written, read, and compared throughout the 64K resident
RAM. A failure of this test causes a display of RAM FAIL
XXXX AA EE on the next line of the CRT (assuming a failure
mode does not prevent display) where: XXXX = failing
address; AA
=
actual data read; EE
=
expected data read.
Nothing will be displayed if there are no failures.
Parity error interrupts are enabled during the RAM test,
and a failure will be reported if a parity error is
detected.
• Graphics, Option RAM - If this option is present, the
graphics RAM will be selected and a 55 hexadecimal and AA
hexadecimal pattern will be stored and tested. A failure
of the test will be displayed on the next line saying
GRAPHICS RAM FAIL XXXX, AA EE.
6-4 62940034 E
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