Re: MAX Machine PLA equations

From: Segher Boessenkool <>
Date: Sun, 7 Aug 2016 12:41:44 -0500
Message-ID: <>
On Sun, Aug 07, 2016 at 02:34:16PM +0200, Gerrit Heitsch wrote:
> >>It depends on what the capacitance is, and how big the leakage is.
> >>You're much more likely looking at milliseconds instead of nanoseconds.
> >
> >For what it's worth, I made a scope plot of A15 and CLK0 on a running
> >machine. You can see it here:
> >
> >
> >
> >It looks strange - sometimes A15 looks as if pulled high during VIC
> >access, and someimes not. I don't know what to make of it.
> The 6703 is not a PLA as the 82S100, so in theory, MOS could make some 
> of the inpute bidirectional. Like use A15 as an input when the CPU has 
> the bus and drive it high or low when the VIC has the bus.

I doubt it does though.  Let's have some die pictures, some of us would
love to see those anyway ;-)


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Received on 2016-08-07 18:00:50

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