Path: utzoo!attcan!sobmips!roe
From: roe@sobmips.UUCP (r.peterson)
Newsgroups: comp.sys.mips
Subject: Re: Control-X on RC-2030 console
Message-ID: <1989Oct7.190837.12240@sobmips.UUCP>
Date: 7 Oct 89 19:08:37 GMT
References: <3940@blake.acs.washington.edu>
Organization: Sobeco Group - Montreal, Canada
Lines: 40

From article <3940@blake.acs.washington.edu>, by lgy@blake.acs.washington.edu (Laurence Yaffe):
> 
>     The RC-2030 (i.e., a system w/o any display) [ ... ]
>     Control-X (at any time) [on /dev/tty1] causes:
> 
>     Enter cmd (help):
> 
> If you type "help", the following rather surprising menu appears:
> 
>     help	.......... display help screen
>     r		.......... read iop memory
>     R		.......... read R2000 memory
>     mr		.......... read map register
>     w		.......... write iop memory
>     W		.......... write R2000 memory
>     mw		.......... write map register
>     set		.......... set/display variables
>     echo	.......... display text
>     i		.......... input from port
>     o		.......... output from port
>     loop	.......... repeat command (num or '~')
>     F		.......... fill r2000 memory
>     go		.......... set iop address
>     FMA		.......... fill with addresses
>     IMA		.......... fill with inverted addresses
>     scsi	.......... dump scsi info
> 

The R[CS]2030 have an I/O processor whose RS232 I/O is performed over
tty1.  This is why, for example, the power-on diagnostic test output
is directed to tty1, not 0 - most of the tests run in the IOP.

So, you are talking the the debug monitor code in the IOP itself.  Any
you are correct - messing about here is a good way to crash machines.

A quick look around does not show how to shut this off - I'll look around
and see what I can find.
-- 
					Roe Peterson
					{attcan,mcgill-vision,telly}!sobeco!roe