MTPR

 The MTPR procedure assigns a value into a VAX internal processor
 register.


 Syntax:

    MTPR( ipr_register_expression, source_expression );


 The 'ipr_register_expression' and 'source_expression' parameters
 are  expressions  compatible  with the unsigned type.  HP Pascal
 stores the  value  specified  by  'source-expression'  into  the
 internal       processor       register       specified       by
 'ipr-register-expression'.

 The HP Pascal compiler generates user-mode code.  HP Pascal does
 not  explicitly  support the running of HP Pascal generated code
 in kernel mode.  However, if the following rules  are  observed,
 then the generated code has a good chance of working as expected
 in elevated access modes:

  o  All code must be compiled with  the  /NOCHECK  qualifier  or
     [CHECK(NONE)]  attribute.   The  HP  Pascal  for OpenVMS VAX
     systems  run-time  signaling  method  relies  on  trying  to
     execute  the HALT instruction.  In user-mode, this causes an
     exception which is  a  signal  to  the  HP  Pascal  run-time
     library.   In  kernel-mode  on  an  OpenVMS VAX system, this
     simply HALTs the machine.

  o  Avoid  all  routine  calls  which  translate  into  Run-Time
     Library  calls.   These  include  all  I/O routines, several
     arithmetic routines, several string routines, etc.