Section 060-INDP-111 System Description 2-61
BMC II BISYNC Operation, Administration, and Maintenance Guide BMCB001 and up
CTC Vector Test
The CTC channels are used as countdown timers and these timers generate
Processor interrupts. When an interrupt occurs, the CTC counter for the
channel is set to a "1" (one). After the interrupt is processed, the counter is
set to "0" (zero). The channels are arranged in a priority scheme to assure that
prompt handling is provided to the associated interrupt.
The CTC Vector test is a running test. Because the interrupts are processed
immediately, the counter for the interrupt must be set back to "0" (zero),
before the program can resume. The CTC Vector test is for CTC channels 1
and 2; channel 0 (zero) is reserved for the clock and channel 3 is not used. If
the counter is not set to "0" (zero), there is an indication that the interrupt did
not receive the proper handling, or did not execute at all, and the following
message is output to the terminal; refer to the procedure for this message and
perform the craftsperson activities listed:
EC-IC-ALM
Clock Operations Test
The clock operations test is a running test designed to ensure that none of the
16 millisecond interrupts generated by the CPU Clock Circuit are missing.
There are two tests, manual and running. For the test, the check routing sets a
counter. This counter is reset for every clock interrupt generated by the CPU
Clock Circuit. If the counter is not reset at the proper interval, or not reset at
all, it is an indication that an interrupt has been missed. If the manual test is
unsuccessful the following message is output to the terminal:
CLK TEST FAIL
SIO Port Check
The SIO port check verifies the integrity of the port vectors. An I/O interrupt
is defined as a "Mode 2" interrupt. This means that when an interrupt occurs,
the "I" register, along with the eight (8) bits from the device form the sixteen
(16) bit service routine.
The test begins by requesting the device's vector. The vector value returned is
checked against the expected value. If there is a mismatch, an error exists.
There are two tests, manual and running. The manual test is initiated at the
terminal and tests each channel on the SIO as described in above. If there is
an incorrect response, the following error message is output to the terminal;
refer to the procedure for this message and perform the craftsperson activities
listed:
xx SIO TEST FAILED
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