I'm thinking that in the old days TTL high logic level was 2.4 volts.
On Nov 5, 2011 1:33 PM, "David Shoemaker" <davids@oz.net> wrote:
> I am trying to trouble shoot a board. I am getting some odd responses
> reading the roms. I noticed that the address lines coming from the 6502
> seem to be going high at 3.5 – 3.7 vdc. I suspect this is causing some of
> the ttl to not latch high.****
>
> ** **
>
> This is checked through a meter using the fluke to read a particular
> address on a loop and using my scope for the same and while running the
> game.****
>
> ** **
>
> Is this a normal value? I don’t see any pull-ups on the address lines on
> the schematic.****
>
> ** **
>
> David****
>
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Received on Sat Nov 5 14:36:36 2011
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