08/05/83 history_regs, hregs

Syntax:  hregs {HREGS_specifier} {-control_args}


Function: Displays a composite analysis or octal dump of the processor
history registers.  This request, hregs, is useful by people who are
knowledgable of the hardware.  The default action is to display the AU,
CU and OU history registers for the pds in a threaded order and
interpreted format.


Argument (HREGS Specifiers):                                            
-condition VIRTUAL-ADDR, -cond VIRTUAL-ADDR                   
   displays history registers from a condition frame, the location of
   which is described by VIRTUAL-ADDR.
-dump                                                         
   displays the "dump" history registers from the BOS CPU at the time
   the dump was taken.
-pds                                                          
   displays the history registers that have been stored in the current
   processes pds (Default).
VIRTUAL-ADDR
   displays the history registers that have been stored at the address
   space specified by VIRTUAL-ADDR.  See virtual_address.info.


Control Arguments:
-au
   specifies that only the APU history registers are to be displayed.
-cu
   specifies that only the CU history registers are to be displayed.
-du
   specifies that only the DU history registers are to be displayed.
-interpret                                                    
   Display the interpreted form of the history registers only
   (Default), or, if -octal is specified, include the octal
   representation also.
-octal, -oc                                                   
   Displays the octal values of history registers only, or, if
   -interpret is also specified, display octal and interpreted form.
   If neither -octal nor -interpret is specified, the default action is
   to display the interpreted form only.
-thread                                                       
   Attempt to display the selected history registers in the "correct"
   order (Default).
-no_thread
   Display the selected history registers in serial order, without
   attempting to sort them.
-ou
   specifies that only the OU history registers are to be displayed.


Notes: Use of the -au, -ou, -cu and -du control arguments imply
   -no_thread and the display will not be in a threaded order.


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Historical Background

This edition of the Multics software materials and documentation is provided and donated
to Massachusetts Institute of Technology by Group BULL including BULL HN Information Systems Inc. 
as a contribution to computer science knowledge.  
This donation is made also to give evidence of the common contributions of Massachusetts Institute of Technology,
Bell Laboratories, General Electric, Honeywell Information Systems Inc., Honeywell BULL Inc., Groupe BULL
and BULL HN Information Systems Inc. to the development of this operating system. 
Multics development was initiated by Massachusetts Institute of Technology Project MAC (1963-1970),
renamed the MIT Laboratory for Computer Science and Artificial Intelligence in the mid 1970s, under the leadership
of Professor Fernando Jose Corbato. Users consider that Multics provided the best software architecture 
for managing computer hardware properly and for executing programs. Many subsequent operating systems 
incorporated Multics principles.
Multics was distributed in 1975 to 2000 by Group Bull in Europe , and in the U.S. by Bull HN Information Systems Inc., 
as successor in interest by change in name only to Honeywell Bull Inc. and Honeywell Information Systems Inc. .

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Permission to use, copy, modify, and distribute these programs and their documentation for any purpose and without
fee is hereby granted,provided that the below copyright notice and historical background appear in all copies
and that both the copyright notice and historical background and this permission notice appear in supporting
documentation, and that the names of MIT, HIS, BULL or BULL HN not be used in advertising or publicity pertaining
to distribution of the programs without specific prior written permission.
    Copyright 1972 by Massachusetts Institute of Technology and Honeywell Information Systems Inc.
    Copyright 2006 by BULL HN Information Systems Inc.
    Copyright 2006 by Bull SAS
    All Rights Reserved