Call for final Elf99 design input

From: Ethan Dicks <erd_at_infinet.com>
Date: Thu Dec 3 14:10:09 1998

>
> Ethan Dicks said:
> >I am cranking along with the capture of the Elf99 design ....
>
> I just found this thread. This is a great idea and should have been
> tried sooner. I'll buy one.

Cool.
 
> >Did I miss anything? Any other suggestions?
>
> The only thing I see missing is the expansion bus connector.
> (Did I miss that part?)

Not explicitly, but I was thinking of bringing in the signals to the
prototyping area in a fashion that was physically compatible with
the Elf-II bus standard.

> There are hundreds of things that would be nice to have, but it's
> important that the design be finished and the boards made. Leave the
> bells and whistles to the end users. If you create an Elf that can
> address about 2K, has a small prototype area, and has a good
> expansion bus, then all things are possible. (Including S-100 interface)
> You should copy one of the two Super Elf buses.

There are *two*? I only know of the one, not that I could find any 86-pin
edge connectors.

> > A protoyping area of .1" spaced plated-through holes, nominally
> > a few inches long by one or two inches wide.
>
> A prototype area should be for wirewrapping. I don't see any need
> for plated-through holes, and pads are not REALLY necessary either.

plated-through holes are cheaper than non-plated-through holes.

> The 1861 should be easy to add on later. In the prototype area or hot melted
> to the top of another chip. Just make sure it's easy to cut the trace for the
> original clock circuit and wire in the new one.

The original clock circuit is a crystal attached to the CPU. Presumably, you'd
just buy the correct frequency crystal (1.7 something Mhz)

-ethan
Received on Thu Dec 03 1998 - 14:10:09 GMT