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)" <email@example.com> > To: firstname.lastname@example.org > 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 ???" :) > > > -- > ___ > / __|__ > / / |_/ Groetjes, Ruud > \ \__|_\ > \___| URL: Ruud.C64.org > > > > De informatie in dit e-mailbericht is vertrouwelijk en uitsluitend bestemd voor de > geadresseerde. Wanneer u dit bericht per abuis ontvangt, verzoeken wij u contact op te > nemen met de afzender per kerende e-mail. Verder verzoeken wij u in dat geval dit > e-mailbericht te vernietigen en de inhoud ervan aan niemand openbaar te maken. > Wij aanvaarden geen aansprakelijkheid voor onjuiste, onvolledige dan wel ontijdige > overbrenging van de inhoud van een verzonden e-mailbericht, noch voor daarbij > overgebrachte virussen. > > APG Algemene Pensioen Groep NV is gevestigd te Heerlen en is ingeschreven in het > handelsregister van de Kamer van Koophandel Limburg onder nummer 14099617 > > > The information contained in this e-mail is confidential and may be privileged. > It may be read, copied and used only by the intended recipient. > If you have received it in error, please contact the sender immediately by > return e-mail; please delete in this case the e-mail and do not disclose it's > contents to any person. We don't accept liability for any errors, omissions, > delays of receipt or viruses in the contents of this message which arise as a > result of e-mail transmission. > > APG Algemene Pensioen Groep NV is registered in the trade register of the Chamber > of Commerce Limburg, The Netherlands, registration number: 14099617 > > > Message was sent through the cbm-hackers mailing list > Message was sent through the cbm-hackers mailing listReceived on 2012-04-25 17:00:41
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