Self Test; Basic Instruction Set Test; Rom Test - HP 3000 Series Installation And Service Manual

Ma
intenance
5-4. SELF TEST
A self-test capability is included in the read-only memory (ROM)
of the INP. A small set of routines, diagnostics, and check-
points are included. The intention of the self-test feature is
to provide a quick indication of whether the communications board
is functioning properly, without either shutting down the system
or changing the hardware components. This self test can be
actua ted ei ther by a software command fr om the hos t 'compute r
system, or by the pressing of a hardware pushbutton switch.
Results of the test are available to the host system as a status
word or to the pushbutton operator visually through an LED
indicator bank located on the front edge of the INP printed
circuit assembly (PCA) board.
When the self test is initiated (either manually or program-
matically), a series of tests or checks is set into operation.
These tests that comprise the self-test program include the
following:
• Basic Instruction set Test
• ROM Test
• Timer Interrupt Test
• RAM Test
• BISYNC Chip Test
• SDLC Ch ip Tes t
As each test is successfully completed, the next test in the
sequence is started until the self-test cycle has been completed.
The red LED indicators (located on the edge of the INP PCA board,
beside of the self-test initiating RESTART switch, as shown in
figure 5-1) wink on and off during the test cycle (approximately
2 seconds in duration) and stop in a pattern that shows the test
resul ts. If LEDs 0 and 7 (the ones at each end of the array) are
the only ones lighted, all tests have been completed success-
fully. Any other pa t te rn ind ica tes a fa ilure. Table 5-1 (unde r
"Troubleshooting") shows the meanings of var ious LED pa t te rns.
The following paragraphs briefly describe each test in the self-
test program.
5-5. Basic Instruction Set Test
The first portion of the INP microprocessor self-test program is
a basic instruction set test. Most of the instructions are
tested. LED 7 is lighted before the start of the test. If the
test is successful, LED 7 is extinguished and LED 6 is lighted.
If the test fails, LED 7 remains lighted.
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