Speaking of Karnaugh mapping, the original paper on it is at http://bh.hallikainen.org//wiki/uploads/karnaugh.pdf . Harold > My two pennorth based on forty years designing logic: > > Up to five inputs it is pretty trivial to use a Karnaugh map for > minimization. > Beyond that I was always inclined to use ROM or PAL rather than discrete > logic. > Too aggressive minimisation can lead to maintenance difficulties.when > nobody can understand the logic. > > __________________________________________ > David C Brown > 43 Bings Road > Whaley Bridge > High Peak Phone: 01663 733236 > Derbyshire eMail: dcb.home@gmail.com > SK23 7ND web: www.bings-knowle.co.uk/dcb > > > > > *Sent from my etch-a-sketch* > > On 30 April 2018 at 13:12, RussellMc wrote: > >> Mildly edited email from a friend. >> Ken says: >> >> I came across this website while looking for a tool to help with >> minimising >> arbitrary 2-level (AND-OR) boolean logic equations: >> >> Direct or link access below may work for you. Otherwise see 3rd option >> >> 1. http://tma.main.jp/logic/index_en.html >> >> 2. *Online minimization of boolean functions >> * >> >> 3. >> =E2=80=8B=E2=80=8B >> http://tma dot main dot jp /logic/index_en.html >> >> =E2=80=8B >> Apologies for the odd-ball URL - I had to obfuscate it as otherwise an >> overly >> officious spam detector objected and bounced my e-mail (saying the >> domain >> main.jp was on their spam list). >> >> _____________________________________ >> =E2=80=8B >> >> >> It seems to work well with the 4-input examples I have thrown at it, >> although >> ultimately it's not of much use for my current problem because I really >> need >> something that I can call from a Pascal program in order to automate an >> optimal >> search that would otherwise be impracticable if done manually. >> >> I have found a Pascal implementation of the classic Quine-McCluskey >> algorithm >> (which is effectively an exhaustive search and which once upon I time I >> sort of >> understood) - but it's written in Italian ! Still that's maybe no >> harder >> for >> me to understand than the many other implementations written in C that >> seem >> to >> exist :-) >> >> Regards, >> >> Ken >> -- >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 FCC Rules Updated Daily at http://www.hallikainen.com Not sent from an iPhone. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .