Date: Sat, 21 May 2022 10:26:14 +0100 From: Steve O'Hara-Smith <steve@sohara.org> To: Polytropon <freebsd@edvax.de> Cc: "@lbutlr" <kremels@kreme.com>, FreeBSD <freebsd-questions@FreeBSD.org> Subject: Re: Single User Message-ID: <20220521102614.7e989516b7cdd18823231f38@sohara.org> In-Reply-To: <20220521110810.376a727d.freebsd@edvax.de> References: <91d28f49-1c1b-d2bf-5fd6-8b2e206ee6c7@andyit.com.au> <20220519132547.6b8cbb36.freebsd.ed.lists@sumeritec.com> <24632e11-1a86-8553-cf44-d29aa40a6858@kicp.uchicago.edu> <CA%2ByoEx8Jk_sceftUUuXi5Hq0Vq2TS=dgAgz7cJ5HweF9u0H5Gg@mail.gmail.com> <4BED02F8-BC45-4170-A59E-CCCB97E59990@kreme.com> <20220520060219.3bcda7d2cdb88efd756953b6@sohara.org> <834ecba8eafd42b8f4efee98cfea719e@kreme.com> <20220520071838.41b3c04b59a1a4b3bccc4bbc@sohara.org> <65A6EAD2-FC33-4260-896A-41385767121F@kreme.com> <20220521110810.376a727d.freebsd@edvax.de>
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On Sat, 21 May 2022 11:08:10 +0200 Polytropon <freebsd@edvax.de> wrote: > As mentioned, teletypes had distinct keys "<" for carriage > return and "≡" for line feed, and when they also had "↩", you > could press that one key and get "<≡" or "≡<" generated. I'd > have to check on the papertape representation in which order > it actually happens - happen_s_ - tempus praesens... ;-) On teletypes it is carriage return then line feed, the reverse order to typewriters. The reason being that the carriage return operation takes longer than 1/30s (the tape reading speed) and so the line feed happens in parallel with the return finishing leaving everything neat and ready for the next line. If you put them the other way round the first character of the next line is printed while the return is happening about a quarter of the way across the page - at least on an ASR-33 that happens. For reliable overprinting it is necessary to send a NUL after the CR to soak up the time. -- Steve O'Hara-Smith <steve@sohara.org>
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