OMNIBUS prototype boards

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toby＠coreware.co.uk

19 Jul 2009 19 Jul '09

8:48 a.m.

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 -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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robert.jarratt＠ntlworld.com

19 Jul 19 Jul

9:45 a.m.

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-----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 -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

I searched the cctech archive, is this the post you were looking for: --- ben franchuk <bfranchuk at jetnet.ab.ca> wrote:

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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