From: sword7@speakeasy.org
Newsgroups: alt.sys.pdp10
Subject: Help! TOPS-20 v4.1 - Password problems
Date: Thu, 25 Jul 2002 01:51:23 -0000
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Sender: Timothy Stark <sword7@grace.speakeasy.net>
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Hello folks:

Does anyone have know how to reset admin password for OPERATOR account?
I forget my admin password on my TOPS-20 v4.1 disk image that I installed 
some time ago.

With my latest version of TS10, I was able boot TOPS-20 v4.1 but forgot 
my password when I attemped to enter 'LOGIN OPERATOR <password>' at @ 
prompt.

Thank you!

-- Tim Stark

-- 
Timothy Stark	<><	Inet: sword7@speakeasy.org
--------------------------------------------------------------------------
"For God so loved the world, that he gave his only begotten Son, that 
whosoever believeth in him should not perish, but have everlasting life.
Amen." -- John 3:16 (King James Version Bible)

######

From: Alan Greig <a.greig@virgin.net>
Newsgroups: alt.sys.pdp10
Subject: Re: Help! TOPS-20 v4.1 - Password problems
Date: Thu, 25 Jul 2002 14:48:18 +0100
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On Thu, 25 Jul 2002 01:51:23 -0000, sword7@speakeasy.org wrote:

>Hello folks:
>
>Does anyone have know how to reset admin password for OPERATOR account?
>I forget my admin password on my TOPS-20 v4.1 disk image that I installed 
>some time ago.
>
>With my latest version of TS10, I was able boot TOPS-20 v4.1 but forgot 
>my password when I attemped to enter 'LOGIN OPERATOR <password>' at @ 
>prompt.

Hmm. Don't have immediate access to an emulator but how about doing an
install but *do not* initialize the file system. Then use MEXEC to get
into EXEC and reset the password. I think there's probably a simpler
way to MEXEC but can't instantly recall.

Or as the password is plain text in as old a version of TOPS-20 as
4.1, if you partially remember the password do a search of the disk
image file.

>Thank you!
>
>-- Tim Stark

--
Alan

######

From: Rich Alderson <alderson+news@panix.com>
Newsgroups: alt.sys.pdp10
Subject: Re: Help! TOPS-20 v4.1 - Password problems
Date: 02 Aug 2002 20:49:38 -0400
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<Sorry to take so long to respond.  I've been working an average of 11.5 hours
 per day on a single project, writing code in a language I didn't know three
 weeks ago.  --rma>

sword7@speakeasy.org writes:

> Does anyone have know how to reset admin password for OPERATOR account?  I
> forget my admin password on my TOPS-20 v4.1 disk image that I installed some
> time ago.

> With my latest version of TS10, I was able boot TOPS-20 v4.1 but forgot my
> password when I attemped to enter 'LOGIN OPERATOR <password>' at @ prompt.

The canonical way is to boot from the console specifying the DDT start address.
(Locations 140 and 142 *both* point to DDT in the DEC standard monitor; the
Stanford monitor follows suit.)  Once in DDT, put -1 in DBUGSW and set a break-
point on GOTSWM ("GOT SWappable Monitor"):

	DBUGSW/   0   -1<CRLF>
	GOTSWM$B   $P

When you hit the breakpoint, remove it (0$1B), and go to .LOGIN (the start of
the LOGIN% JSYS code).  Type linefeeds until you find the call CALL CHKPSW
(which *might* look like "PUSHJ P,CHKPSW" but I don't think your monitor is
that old).  JFCL both the call and the following instruction (password check
skip-returns on success), and proceed the monitor.

	.LOGIN/   JSP CX,.STKST   
	.LOGIN+1/   T3   
	.LOGIN+2/   MOVEM T1,-2(P)   
	.LOGIN+3/   SKIPGE CX,GTOKPR+4   
	.LOGIN+4/   SKIPA    
	.LOGIN+5/   TLNN CX,200000   
		.
		.
		.
	.LOGIN+51/   TRNE T1,600000   
	.LOGIN+52/   JRST LOGI1#   
	LOGI2#/   SKIPE T2,CRJFLG   
	LOGI2#+1/   TRNN T2,1   
	LOGI2#+2/   SKIPA    
	LOGI2#+3/   JRST LOGI1#   
	CHKPVL#/   CALL CHKPSW   
	CHKPVL#+1/   JRST LOGI3#   
	CHKPVL#+2/   MOVEM T2,-3(P)   

(There is no guarantee that either LOGI2 or CHKPVL will occur in your monitor,
depending on its age.  Start from .LOGIN and you'll win.)

You can then log in without a password as any privileged account and set the
password for OPERATOR and any other thing you might wish to do.

-- 
Rich Alderson                                          alderson+news@panix.com
  "You get what anybody gets.  You get a lifetime."  --Death, of the Endless