RE: FPGA (was: 6809 / 6702 puzzle)

Ruud,

The first set of schematics I came across was at 'http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/b/8088.gif'. 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 http://www.baltissen.org/images/cbm8088.png'' and the other at 
'http://www.vintagecomputer.net/commodore/8088_co-processor/CBM_8088_CPU_co-processor_schematic.pdf'.

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 
(www.zimmers.net) 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 ruud.c64.org!

Dave


> Message Received: Apr 25 2012, 06:35 AM
> From: "Baltissen, GJPAA (Ruud)" <ruud.baltissen@apg.nl>
> To: cbm-hackers@musoftware.de
> 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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