Maybe we've gone full circle. I just bought an $11 part on eBay. I it is a CPLD. Like an FPGA but smaller and much less expensive and easier to use. The programming software has a mode where yu can call up a library of old 74LSxxx parts and drop them on a canvas and draw lies between pins. They have other functional blocks too, just see of them have the old 7400 numbers. I did something silly wired a bunch some LEDs to a 4-bit counters and watch in count in binary. The 7400 series versions "Hello World" but now I can do that with just one chip. The little CLPD can simulate maybe 100 7400 type chips and they can be clocked at 50MHz
SO it is the one chip solution that you wanted but the old SSI based solution that engineer wanted t build. My use for it was counting encoder pluses up to about 1MHz. but I found I could do that with a microcontroler for 1/3rd the cost and size. On Sun, Jun 24, 2018 at 4:05 PM John Dammeyer <jo...@autoartisans.com> wrote: > > > What we have is the result of historic accident. EMC and machine > control > > in general got its start when computers where EXPENSIVE. You design > > differently when you parts for five digit price tags than when you parts > > are nearly free. If computers cost $2 and two of them could fit on your > > thumbnail then you might just be inclined to use more of them. > > I remember having arguments with an engineer about using micro-processors > (with EPROM) to do simple logic. He was adamant that TTL was a better > solution because the processor was too expensive. My point was that > processors were coming down in price and there were now single chip ones > with EEPROM windows (before onboard flash) and that one chip would do the > job of a large number of discrete devices. > > At the same time I was wire-wrapping up an S-100 board with an NED u7220 (I > think that was the number) video controller and the rest of the logic was > all 74S series. He was wrong of course. Many projects don't need 20 TTL > or > CMOS chips and an Arduino is an ideal replacement. But only to a limit. > > > Combine the high-reduction cycloidic drive with a small low cost BLDC > > motor > > and you have a point for a robot arm (or leg) or a machine tool axis. > > Here is a model of one of these motor and all -- please try the "explode" > > button to see the insides of the drive. (The button turns the drawing > into > > a parts diagram) https://a360.co/2KhamaI > > > Very cool! > > > > OK back to real-time... > > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
