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HP 27130B
registers cannot be tested (they are write only), and the DMA test does not exercise all possible
DMA configurations (time limitations).
Upon successful completion, self -test will set 'Passed Self -Test' status (PST), turn off the LED on the
card, and invoke the standard MUX firmware. The standard firmware will then wait for the host to
'teach' it its Peripheral Address (PA).
If
self-test fails, the LED is left on, the 'Passed Self-Test' status (PST) is not set, and the Z80 is
'Halted'.
The following time-line illustrates the host/card interactions during the self -test sequence:
Host
to
sends card
DCl or assertsl
RES after a
power-on
Teach card
PA.
Wait time t2
or poll PST
where:
t1
t2
t 1
1 .0 second
Card
Self-test begun
Successful:
Set PST
Turn off lED
Unsuccessful:
Hal t Z80
t2
3 seconds if RES, or 15 seconds if DCl/DEN;
may
be less
CONNECT LOGICAL CHANNEL REQUEST DEFINITIONS
The following paragraphs describe the subfunction options that are available for each Connect Logical
Channel (CLC) request. See the paragraph "Connect Logical Channel (CLC) Request Format" for a
description of the data format.
4-19
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