Clip from Wikipedia https://en.m.wikipedia.org/wiki/12-hour_clock#Confusion_at_noon_and_midnight
If you read on there is a fair bit of confusion around 12am and 12pm Ian It is not always clear what times "12:00 a.m." and "12:00 p.m." denote. From the Latin words meridies (midday), ante (before) and post(after), the term ante meridiem (a.m.) means before midday and post meridiem (p.m.) means after midday. Since "noon" (midday, meridies (m.)) is neither before nor after itself, the terms a.m. and p.m. do not apply.[2]Although "12 m." was suggested as a way to indicate noon, this is seldom done[20] and also does not resolve the question of how to indicate midnight. > On 21 May 2021, at 23:22, tntmod54321 <tntmod...@gmail.com> wrote: > > > I guess my phone has the same 12am error then, im pretty sure that 12am is > correct as stupid as it is. > >> On Fri, May 21, 2021, 4:58 PM Jeff Walton <jwalton...@gmail.com> wrote: >> I designed a nixie about 50 years ago that used all 74xx logic and a few >> discrete transistors. It was wired point-to-point to the IC’s (no sockets) >> and it ran for 35+ years. The only logic mistake that I made was that I did >> the AM/PM indicator and was all proud of it and someone pointed out to me >> that PM changes to AM at midnight, not 1 AM. It was going to require all >> new logic and I never changed it but it sure was unique. I used mains >> frequency division and a 74123 as a monostable-one shot timer for the input >> to the frequency counter to eliminate line noise. That resolved all of the >> noise issues, which were a real pain until I did that. >> >> >> >> It was a wonder that I didn’t damage the ICs by soldering directly to the >> pins and using old telephone twisted pair wires for the connections. I was >> a poor college student and scrounged everything I could find… >> >> >> >> Jeff >> >> >> >> >> >> >> >> >> >> From: neonixie-l@googlegroups.com On Behalf Of newxito >> Sent: Friday, May 21, 2021 1:49 PM >> To: neonixie-l <neonixie-l@googlegroups.com> >> Subject: [neonixie-l] logisim-evolution >> >> >> >> I always wanted to design a nixie clock that uses just 74xx ICs. I know that >> there are some schematics available but just copying a design is not fun. >> >> Recently, I watched a video from CouriousMarc with an intro to a digital >> logic circuit simulation software called logisim-evolution. I think that >> will be a big help, the software looks great! >> >> -- >> You received this message because you are subscribed to the Google Groups >> "neonixie-l" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to neonixie-l+unsubscr...@googlegroups.com. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/67428246-9640-41f0-af09-5c281c524554n%40googlegroups.com. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "neonixie-l" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to neonixie-l+unsubscr...@googlegroups.com. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/026e01d74e84%2419f58790%244de096b0%24%40gmail.com. > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to neonixie-l+unsubscr...@googlegroups.com. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/CAPDJQ6A11yM6bniBD1nyZXSEanPTY_9wA08%3D-%2B684pbGBNuM%3Dw%40mail.gmail.com. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/9F485AEB-EF00-4E0C-AD32-6881B1B1C984%40yahoo.co.uk.
