  CXY08, CXA16 Q-bus CSR Settings? 
 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).
 
 Answer written or last revised on  26-NOV-2001 
