3 Dec
1998
3 Dec
'98
6:10 a.m.
Ethan Dicks said:
Cool.
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. Did I miss
anything? Any other suggestions?
The only thing I see missing is the expansion bus connector.
(Did I miss that part?) 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. 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