25 Oct
2018
25 Oct
'18
12:24 p.m.
On 10/25/2018 01:28 PM, ben via cctalk wrote:
On 10/24/2018 9:00 PM, Jon Elson wrote:
Likely make a fortune off my stockpile of 2901s.?
Building machine from the earth up is not that hard, software to make
them useful is a big deal.
On 10/24/2018 01:11 PM, ben via cctalk wrote:
I just orderd 4 2901's off ebay, So I do plan to build something up to
32 bits. On 10/24/2018 10:31 AM, Marc Howard via cctalk
wrote:
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. 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.
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.
The problem is you need to hunt down the libraries or use a tool that
has libraries.? Kicad and Eagle are
work for me.
Once you have libraries that have those doing it become easy.? IF not
draw them!
?
Allison
Jon