Hallo Jim, > The system uses the E pin on the '816 to interpret setting the port pins: > .... I really like that :) That would give me the 65816 I always liked to have. It does mean that the Kernal has to be rewritten but I wouldn't mind. May I politely point you to something? In the early days I equipped a VIC-20 with a 65816 and an ISA expansion. After building the whole thing I found out that I had misunderstood the behavior of the RDY input. Negating RDY does stop the 65816 from performing any instruction but does NOT stop it from outputting the content of the bank register on to the data bus when E is (L). In time I found a solution by keeping the clock input (H) during the time RDY was (L). You'll find the schematic at: http://baltissen.org/newhtm/65sc816.htm I hope this is some help. Met vriendelijke groet / With kind regards, Ruud Baltissen www.Baltissen.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 Groep N.V. 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 its 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 Groep N.V. is registered in the trade register of the Chamber of Commerce Limburg, The Netherlands, registration number: 14099617Received on 2018-07-17 09:00:17
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