help - 11/34 console problem -- CNTRL key behaviour
henk.gooijen at oce.com
Fri Nov 11 06:01:12 CST 2005
> > Ok, so the CNTRL key behaviour analysis is a good point
> > to start with.
> Well, it's a definite fault. I would guess the firmware is
> doing the wrong thing (I can't see how a hardware fault in
> the keyboard or display could do this).
> > But I will first inspect the two RAM chips!
> What are the RAMs? From the description, they sound like the
> little TTL RAMs that DEC also used for register storage on
> some of the '11 CPUs
If my eyes read it correct, the RAMs are DEC 85S68. A Google
search shows that it was made by National Semiconductor and
that it is a 64-bit static RAM. My eyes are still good :-)
I did not find a datasheet, unless you order and pay for it!
The schematic is clear enough to figure things out ...
- Henk, PA8PDP.
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