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The Question is: Where can I get information on the switch settings for a CXA16 q-bus card? I have a Microvax 3800 that I would like to put the card in. The Answer is :
The available hardware information is referenced in the OpenVMS FAQ.
You will specifically want to review existing discussions of correctly
determining and setting the CSR and interrupt vector -- you must read
and understand the information included in topics (407), (1149), (1866)
and (3232).
You must follow the procedures described in the topics (407), (1149),
(1866) and (3232) to correctly determine the settings for your particular
Q-bus configuration. Failure to determine the correct CSR and vector
settings on all Q-bus modules -- when adding or removing any Q-bus
controllers -- can result in system instability, system crashes, and
system hangs.
The following are two potential CSR and vector settings for the CXY08
and CXA16 series serial line terminal controller devices, and these may
or may not be the correct settings for your configuration.
Module CSR/Vector CSR Switchpack Vector Switchpack
1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8
CXY08 760440/300 x 0 0 0 0 1 0 0 1 0 1 0 0 1 1 0 0 0
CXA16 760460/310 x 0 0 0 0 1 0 0 1 1 1 0 0 1 1 0 0 1
1 = closed = on
0 = open = off
+ = assumed bit, no switch present.
CSR bits 3-4-5, 6-7-8 and 9-10-+ encode the low three octal digits of
the CSR -- bit 2 encodes a six in the fourth digit of the CSR when zero
and a seven when set, and an eleventh bit position (+) is assumed present
and assumed to be zero. Vector bits 3-4-5 and 6-7-8 encode the top two
digits of the vector, the least significant digit is assumed to be zero
and thus not encoded.
For the CXY08 and CXA16, CSR bit 1 defines the DHU vs DHV emulation.
With the module handle held away from you, the CSR switchpack is
located to the left.
YOU MUST READ AND UNDERSTAND TOPICS (407), (1149), (1866) and (3232).
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