LOADABLE MCRDRIVER -- EDDRV

          Included on this dist
ribution tape is a prototype  mcr  driver
     with  a  loadable  data  base.  
 As  it was implemented before V3.1
     RSX11M, it includes the ability to ret
urn a user's logon  UIC.   It
     is  intended that this driver will be develo
ped into a general tool
     for returning information from  the  EXECUTIVE  wi
thout  having  to
     write a specialized privleged task.

          The pro
spective user will note  that  an  interupt  vector  is
     specified  in  the
  driver's data base.  Any unused vector will do.
     We have not been  able  
to  get  ...LOA  to  LOAD  EDDRV  unless  a
     vector(and  CSR) are specified
.  The source files are EDDRV.MAC and
     EDTAB.MAC.



          For thos
e who would like to issue MCR commands from a task but
     who  do  not  have 
 loadable driver support in their system and who
     don't want to do another 
SYSGEN for a while, we are  including  the
     source  file  for  MCRUN.  Once
 MCRUN is built and installed in the
     user's system, any task can send an  
ASCII  MCR  command  to  MCRUN
     using  the SEND directive.  Note, that the 
maximum lenght of an MCR
     command sent in this manner is limited by the len
gth of the  direc-
     tive's  buffer  to  24 characters.  A rewrite of MCRUN 
using memory
     management directives could overcome  this  restriction.   Fo
r  now
     however,  the  first word of the send buffer is unused.  Words 2-13

     are a packed ASCII MCR command.