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Polarity Insensitive Serial Comms
Biphase mark (or space). It's polarity and to some extent (a factor of ten or so) speed independent. An external xor gate simplifies decoding but is no means essential,...
Tuesday, 7 December 2021 - 18:07
PAL - a modern equivalent for combinational logic
Or another - the insides of a 74HC181 ALU. I need that to simulate it but I can at least buy them off the shelf :)   Neil
Friday, 26 November 2021 - 09:03
PAL - a modern equivalent for combinational logic
  Here you go, Cliff - one of the simpler bits, just six in and ten out... it controls the ALU operation and routing.     The more complicated bits aren't designed...
Friday, 26 November 2021 - 08:58
PAL - a modern equivalent for combinational logic
Scroungre wrote: If you really want to demonstrate logic, build a Babbage engine.    Static power consumption zero, dynamic power consumption limited by how hard you...
Thursday, 25 November 2021 - 10:25
PAL - a modern equivalent for combinational logic
Very high speed isn't critical but probably low megahertz... delays through the existing (inasmuch as it's simulated, but not yet designed using actual parts) are only three or...
Thursday, 25 November 2021 - 05:59
PAL - a modern equivalent for combinational logic
Thank you all, folks!   Looks like there isn't anything that's exactly what I want, but some possibilities if I decide to go that way. For now I suspect I'll stick with my...
Wednesday, 24 November 2021 - 06:20
Problem ssh:ing into a Linux machine
It's inactive on my vanilla Mint installation; I've never had cause to use it.     Neil
Wednesday, 24 November 2021 - 06:09
Do Not Understand This Programming Style!
I'd agree - it looks like someone has aimed for consistency in the source code.   I'm less consistent:   // source registers - bits 0-3 #define S_B 0 #define S_C 1 #...
Wednesday, 24 November 2021 - 06:02
PAL - a modern equivalent for combinational logic
Scroungre wrote:22V10s are still being made (by Lattice Semi, among others), and come in several zillion varieties of low voltage, low power, cost, package, and high speed....
Tuesday, 23 November 2021 - 18:57
PAL - a modern equivalent for combinational logic
Hmm. Thanks, possibilities there though I fear the current consumption may still be too high - I've not used them before but I'm assuming that they can be used in a straight...
Tuesday, 23 November 2021 - 14:22
Is i++ atomic on the AVR C compilers
Surely the naive approach might be "it's only atomic if it's wrapped around with an interrupt disable"?   Neil
Monday, 22 November 2021 - 14:51
expected identifier or '(' before 'if'
Remember that a warning should in many cases be considered an error... it usually translates as 'you did something unusual, is that *really* what you intended?'   Neil
Saturday, 13 November 2021 - 22:01

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