OMNIBUS prototype boards

[Robert Jarratt]

> -----Original Message-----
> From: cctalk-bounces at classiccmp.org [mailto:cctalk-
> bounces at classiccmp.org] On Behalf Of Tobias Russell
> Sent: 19 July 2009 16:48
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: OMNIBUS prototype boards
> 
> A few months there was some discussion about prototyping boards for
> OMNIBUS, UNIBUS and QBUS. I seem to recall that someone provided a link
> to a manufacturer who still produces some. I've searched hard to try to
> find the original post but I've drawn a blank. I don't suppose anyone
> can remember the url?
> 
> Many thanks,
> Toby
> 
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I searched the cctech archive, is this the post you were looking for:

--- ben franchuk <bfranchuk at jetnet.ab.ca> wrote:
> PS. Yes you can proto-type chips but it is not cheap. A ballpark
> figure is about $500 to $1000 each.  http://www.mosis.com/

Hmm... my first thought was for bus driver/receiver chips from the
OMNIBUS days (DEC 8881 and friends), but after a little reflection,
I doubt the current fab processes would easily approximate the
characteristics of those ancient chips we'd be trying to reproduce.

The only thing in favor of such an endeavour is that the tolerances
30 years ago were so sloppy compared to today that it wouldn't be
impossible to get something that behaved well enough, but didn't
depend on some of the manufacturing specifics.

-ethan