On 10/24/2018 9:00 PM, Jon Elson wrote:
On 10/24/2018 01:11 PM, ben via cctalk wrote:
On 10/24/2018 10:31 AM, Marc Howard via cctalk wrote:
You know that since you mentioned possibly using CMOS 22V10's why not
just
build a board around AMD 29XX bit slice parts. They actually predate
22V10's by quite a bit and you can pretty much implement what every you
want to without rewiring.
Marc
* LOW POWER and REPROGRAMABLE * reglar 22V10's are 100 ma per chip,
and I can buy them online. I have 5 2901's but I can only find them on
ebay now. If I design a register based machine I have them, other wise
TTL is better for odd sized word lengths.
Ben.
Well, I built a 2903 + 2910 32-bit microcoded machine in 1982 or so. See
http://pico-systems.com/stories/1982.html
for gory details. But, today, it would make WAY more sense to do it
with FPGAs. Want to try an experiment? Don't get out the wire-wrap gun
or soldering iron, make a copy of the FPGA files and edit away. If it
doesn't work, you don't have to undo the wiring changes! Also, the FPGA
version might be as much as 10 times faster.
I just orderd 4 2901's off ebay, So I do plan to build something up to
32 bits.
I have a DE1 FPGA setup for proto typing, but free pcb board layout
programs all seem to suck for me. There is nothing for doing things like
switches or card edge foot prints, but a gizzion and one surface mount
that common people never use.
Jon
