On 10/25/2018 01:28 PM, ben via cctalk wrote: > 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.
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. > 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 >> >
