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's contributions
    • There is an interesting design idea in EDN. "Encode a remarkable 74 switches with only four IOs using Charlieplexing’s cousin. Add on an LCD interface and save even more." "Encode dozens of buttons with only four lines"

    • There is an Idea for Design that creates the PWM in an analog fashion here "Enhanced Circuit Yields Versatile, Efficient Switch-Mode Solenoid/Relay Driver"

    • Chas56 "We had reels of the stuff everywhere!" I used to use empty cotton reels I got from my mom. And then I would wind the tapes using the stand from a manual grinding wheel. I described my memories in a blog: "How It Was: Programming (and debugging) microprocessors"

    • Sgh798 Thanks for the additions. "Of course AMD got rather distracted by the PC market since then!" As part of that they discontinued some fine peripheral chips like the Am9513 System Timing Controller alternately sourced by Zilog, although I am not sure who was actually the 2nd source. Remember 2nd source-ing?

    • Rallyr Thanks for the additions. I do remember the 64180- I seem to remember a Steve Ciarcia/Circuit Cellar article in Byte about it. NEC was not represented in South Africa and so I never was even able to consider it, even though I did work with the Z80 for a while. The TMS9900- I seem to remember a modern reference to it in the series "Halt and Catch Fire". TI must have had their share of less- than-successful micros. There was also the TMS7000 series. Can anyone think of others?

    • Now that you mention it, I do remember the 2650. I still have a scanned data sheet (see "Preserving Data Books From Yesteryear" ). I never used it, but I am sure I did play with its companion the 2651 the Programmable Communications Interface, competitor to Intel's 8251 although for the life of me, I cannot remember its advantages.

    • Max It always seems to happen- I read an article, think a bit and then dismiss it with- "interesting, but I'll never have to do this." And then the universe bites me in the rear end... I have just been working on my implementation if this and it occurred to me that instead of polling every hour, I just set the alarm for the next DST event. When the alarm is detected I then bump the alarm setting to the next DST event. This avoids the loop back issue in the fallback event. If I ever get to write blogs again, this would certainly be a contender as a topic for one of them.

    • There is now a blog on Planet Analog "Corralling switch and sensor inputs in industrial applications" ( ) It describes two new TI 24 bit parts the TIC12400 and the TIC10024 and