[Fwd: Re: SuperPET MMU]

[Jim Brain]

I hate to include folks mid-discussion, but Mike is trying to get the 
SuperPET functionality running, and it refers to a HOSTCM program 
running on VM/CMS.  Anyone have a copy, some insight, etc.?

Jim


-------- Original Message --------
Subject: 	Re: SuperPET MMU
Date: 	Wed, 10 Sep 2008 13:17:20 -0700
From: 	Mike Naberezny <mike at naberezny.com>
To: 	Jim Brain <brain at jbrain.com>
References: 	<48C2236E.5060303 at naberezny.com> 
<48C352FD.1040200 at jbrain.com> <48C3574B.8010805 at naberezny.com> 
<48C59CCB.1000300 at jbrain.com>



Jim Brain wrote:
> Hmm, a mystery.  Any chance you can sniff the UART traffic?

Yes, I can do that.  I already made a sniffer for another project.  I'm not 
sure it will give much insight with the SuperPET alone.  I'd probably need to 
listen to something speaking HOSTCM with the SuperPET.  However, observing the 
bytes sent from the SuperPET when it initiates a transfer might give clues.

I did find something interesting in a VM/CMS (mainframe OS) reference manual 
[1].  If you search for HOSTCM in that document, there is mention that a 
"MANUAL" command outputs the HOSTCM specifications.  It also says "The KERMIT 
command also performs most of the functions of HOSTCM".  It seems likely then 
that HOSTCM is a built on the Kermit protocol.

This seems further confirmed by a message [2] from William Levak on 
cbm-hackers a while back.  Although all of his attempts to transfer files from 
the SuperPET with "normal" file transfer protocols failed, he says Kermit did 
more than the others.

This gives me a few good next steps.  I'll play around with Kermit while 
monitoring the RS-232 lines.  From web searches, I found there are also some 
mainframe guys that are running VM/CMS in emulators these days.  I'll try to 
make some contacts and see if someone has HOSTCM and can run that "MANUAL" 
command on it.

Regards,
Mike

[1] http://ukcc.uky.edu/ukccinfo/391/cmsref.html
[2] http://www.softwolves.pp.se/misc/arkiv/cbm-hackers/1/1128.html

-- 
Mike Naberezny (mike at naberezny.com) http://6502.org


-- 
Jim Brain, Brain Innovations                                      (X)
brain at jbrain.com 
Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times! 
Home: http://www.jbrain.com