Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: rbowman Newsgroups: comp.os.linux.misc Subject: Re: Turn Your Radio On ... Date: 2 Feb 2025 20:27:39 GMT Lines: 19 Message-ID: References: <_hycnQxlN5kAphr6nZ2dnZfqn_SdnZ2d@earthlink.com> <380b1c81-2b3c-6409-6bbd-edfba43be389@example.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Trace: individual.net fwLmIOzYjVqgrGREISPpgwgBC+1RMlpLatox6CRLpyBP1YkMCw Cancel-Lock: sha1:bUiqA7jF4kIhevdrU7GRD8PzlE8= sha256:RS7ToVjjpXrrLZVoJ0Eh7+18W2yUGM4WZ8bZZ+6HGvM= User-Agent: Pan/0.155 (Kherson; fc5a80b8) Xref: csiph.com comp.os.linux.misc:65144 On Sun, 2 Feb 2025 10:20:29 +0000, The Natural Philosopher wrote: >> PAL crystals were used in some markets to be compatible with the TVs >> but never had the off label reach. > > I don't actually understand that statement Several home computers had US and European versions and would use the PAL or NTSC crystals to be able to generate video. However, at least in the US, NTSC crystals were dirt cheap and used in applications that had nothing to do with TVs. One example is DTMF decoders. https://www.electronics-diy.com/dtmf-decoder-using-mt8870.php Unless you had some compelling reason when building a Z80A board using a crystal you could pick up at RadioShack was the way to go. It was also a handy frequency for the 80M ham band, and 40M with a doubler. Maybe PAL crystals were used like that in Europe. No clue.