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Re: AppleLogic.org Question
In article <gr5uvh$jb5$1@adenine.netfront.net>,
Alex Freed <alex_news@mirrow.com> wrote:
> MdntTrain wrote:
> > On Apr 3, 1:37 pm, Alex Freed <alex_n...@mirrow.com> wrote:
> >> One thing comes to mind. We were thinking about creating a Mill
> >> 6809 card as one demo configuration that is simple enough to serve
> >> as an example. Unfortunately the schematics we found is inaccurate
> >> or incomplete. Would be great to be able to borrow an operational
> >> card to use as a prototype. Non-destructively :)
> >
> > Since I started the whole Stellation Mill-on-FPGA thing, I'd be
> > glad to do the work of correcting the schematic if lent a card.
> >
> > Alex, I'm glad you said something as I was planning on attempting
> > the implementation either in FPGA or wirewrapped actual, based on
> > that schematic I sent you.
>
> The problem with the available schematics is that it doesn't show
> what signal controls the address buffers U12-U14. Clearly the card
> can't always drive the bus. This may well not be the only error. A
> high-res picture of the back of the card may help a lot.
My schematic says:
LS367 for U12, U13, U14
note: pin 1 & 15 of LS367's connect to VMA.
Um, I'm guessing VMA isn't vanilmandelic acid or video music award. :-)
--
John B. Matthews
trashgod at gmail dot com
<http://sites.google.com/site/drjohnbmatthews>