Unisys MCP (was: Re: UniSys ClearPath OS/2200 Express?)

Kevin Monceaux Kevin at RawFedDogs.net
Fri Jul 3 09:24:04 CDT 2020


On Thu, Jul 02, 2020 at 01:41:53PM -0700, Alan Perry via cctalk wrote:
> I have never had Windows stop working despite not activating it and have
> gone at least 6 months without doing so.

That's encouraging.

> I have been using those blogs to remind myself of how it all work.

As someone new to MCP they've been a big help.  This morning I started
reading through the system operations guide, 86000387-512.  Some concepts
are going to take some getting used to.  MCP physical and logical files are
a bit different than AS/400 physical and logical files.  Also, according to
the system operations guide, a CD-ROM is a magnetized disk.  I thought all
CD-ROMs were optical disks.

> I did my day-to-day work with CANDE (Command AND Editor) and with MCP 
> Express one get to that through MARC. However, when I run the MARC 
> script, the Windows VM crashes.

This blog post:


says that other terminal emulators can be used to access the communications
interfaces, including MARC and CANDE.  Does anyone know how?  I've tried
connecting with PuTTY to the standard telnet port and the port the included
MARC terminal shortcut uses to no avail.


Bruceville, TX

What's the definition of a legacy system? One that works!
Errare humanum est, ignoscere caninum.

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