RE: FPGA (was: 6809 / 6702 puzzle)

Date: Wed, 25 Apr 2012 18:04:29 +0200
Message-ID: <32513589.646651335369869595.JavaMail.www@wwinf3712>

The first set of schematics I came across was at ''. I was analysing 
this diagram first - and this was the one where I found the errors.

I then did another web search yesterday and found two more sets, one at'' and the other at 

I have literally finished cross-checking them and the latter two appear to agree with each other.

So, yes, there appears to be at least three different schematics for the add-on 8088 coprocessor card - one of which contains errors 
( and should, therefore, be avoided.

I think I said in my earlier post that your reverse-engineering diagrams didn't have the errors that I found in the zimmers schematics.

By the way, I love the home page for!


> Message Received: Apr 25 2012, 06:35 AM
> From: "Baltissen, GJPAA (Ruud)" <>
> To:
> Cc: 
> Subject: RE: FPGA (was: 6809 / 6702 puzzle)
> Hallo Dave,
> > I was having a look at the schematics ....
> > ... and noticed a number of errors and deficiencies ...
> Huh?
> > I came across two other schematic diagrams for the 8088 card
> > (one on Ruud's website and one on vintagecomputer).
> > Both of these schematics appear to not contain the issues
> I didn't know of the other schematics so I immediatly thought: "What
> have I done wrong ???" :)
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Received on 2012-04-25 17:00:41

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