DUA1:<SYS0.SYSMAINT>EHXDZ.HLP;1
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1 HELP
  EHXDZ
                            
        This program checks the functionality of the  DZV11 providing
        error messages that may aid in the repair of the device.  The
        diagnostic uses the internal loopback  mode to  check most of 
        the circuitry of the device.

1 DEVICE

        This program will be runnable only on a MicroVAX I computer and with
        a VAX Diagnostic Supervisor of version  6.12 or later.  This program
        is  a level 3 functional diagnostic and will  not support any device
        other than the DZV11.
   
2 DZV11

  Description:   DZV11 Asynchronous four-line communications interface
  link:      HUB
  Generic name:  TTa
  Additional information:
     QBUS CSR [octal 760000-777776]<760100>
     QBUS vector [octal 2-776]
  Tested by: EHXDZ

1 REQUIREMENTS

  HARDWARE:            MicroVAX I processor with 512Kb of memory
                       DZV11 M7957


  OPTIONAL HARDWARE:   H329 turn around connector
                       Another terminal

  SOFTWARE:            Vax Diagnostic Supervisor V6.12 or later


1 EVENT

  There are no user-settable event flags.

1 QUICK

  This diagnostic does not use the VDS QUICK-pass flag.

1 SUMMARY

  This diagnostic does not produce a summary report.

1 MANUAL

  Test section ECHO (test 22) requires manual intervention.  A terminal
  must be connected to one of the channels  and the operator must
  enter characters finishing with a control-z to complete the test.

1 SECTIONS

  This program consists of 22 tests in six sections.   The  default  and
  "INTERNAL" sections include test 1 thru 19.   Section  "ALL"  includes
  test 1 thru 21 and requires an H329 turn  around  connector.   Section 
  "MODEM" is test 20 and requires a h329 turn around  connector. Section 
  "STAGGERED" includes tests 20 and 21 and requires  an H329 turn around
  connector.  Section "ECHO" is test 22 and requires manual intervention
  and a terminal connected to a DZV11 channel.

2 DEFAULT

  Used for minimal testing.  This section includes tests 1 thru 19.
  Internal logic is tested.

2 INTERNAL

  Used for minimal testing.  This section includes tests 1 thru 19.
  Internal logic is tested.  This is exactly the same as the DEFAULT
  section.

2 MODEM

  Used to test the modem control feature.  Requires an H329 turn aournd
  connector.  This section includes test 20 only.

2 STAGGERED

  Used to test staggered loopback mode.  Requires an H329 turn around
  connector.  This section includes tests 20 and 21.

2 ALL

  Used to test all internal circuitry.  Requires an H329 turn around
  connector.  This section includes tests 1 thru 21.

2 ECHO

  Used to verify communications with an external terminal.  Requires
  manual intervention and a terminal.  The operator  is  required to
  respond  to one  question on  the console and to enter  characters
  on the  external  terminal.   The  test completes when a control-z 
  is entered.  This section includes test 22 only.

1 ATTACHING 


  The following is an example of how to attach the device to be tested,
  and to load and run EHXDZ (answers to hardware questions are typed in
  octal).

  DS> LOAD EHXDZ                  ; load the diagnostic
  DS> ATTACH DZV11                ; attach the DZV11
  Device link? HUB                ; the option is linked to HUB
  Device name? TTA                ; the option is named unit A (range=A-Z)
  CSR? 760100                     ; the csr address is 760100
  Vector? 300                     ; vector address is 300 (range=000-770)  
  DS> SEL TTA                     ; select device
  DS> START                       ; start the diagnostic

