Burroughs Large Systems

A couple of sightings on social media:

with photos (see below)



There are a couple of simulators available for the B5500:

  1. Paul Kimpel’s “retro-B5500” browser-based simulator,
    (The same gentleman has also done simulators for
    the Burroughs/Datatron 205
    and the B220

  2. Richard Cornwell’s SimH-based B5500
    (sims on github)

Both 5500 simulators will run MCP XIII, available under
license for non-commercial use from Unisys.
(It was thanks to Sid McHarg that the MCP tapes
from ca. 1970 were preserved.
(“Burroughs B5500 Mark XIII System Software” on retro-B5500)

Both Paul Kimpel and Nigel Williams (of retroComputing
Tasmania) have been looking for some years now for an
early version of MCP that would justify a simulator for
the B6500/B6700, but so far nothing has turned up.
simulating a Burroughs B6700 system? (archived thread from comp.sys.unisys)

One interesting piece of software for the B5500 that has
been preserved and transcribed is a 6500 simulator that ran
on the 5500 and was used by Burroughs to develop the initial
version of MCP for the 6500. We also have the “MCP 0.0” that
ran on the simulator, and the B6500 Espol implementation compiler
(the cross-compiler that ran on the B5500, and that has already
successfully compiled MCP 0.0 on retro-B5500). However, to date
no one (as far as I know) has yet attempted to actually run
the 6500 simulator on retro-B5500 (or even quite knows how to
do so).

There’s a short film about the development of
the B6500 on YouTube:

1969 Burroughs B6500 Computer Vintage Mainframe History
(UNISYS, Data Processing, Pasadena))
Jul 5, 2016
Computer History Archives Project


What happened with the [link rejected] failed links? Only two links seem to have made it…

Oh dear, I think that’s a technical measure, that very new users can only post limited numbers of links. @Jim_F please keep hold of those valuable links! If you send them to me in a PM I can (probably) edit them into your post.

Well, any links I attempted to provide in the original
post were there simply for the convenience of the
reader. There’s enough context so that anybody who
is really interested can use Google to find the
relevant Web pages.

Here’s one, though, for the retroComputing Tasmania page
on the B6700:


Thanks @Jim_F for the extra link - also, you’re right, I was readily able to supply the missing links from your post.

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