Date: Sat, 24 Feb 1996 13:02:09 +1030 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: terry@lambert.org (Terry Lambert) Cc: petzi@zit.th-darmstadt.de, hackers@FreeBSD.ORG Subject: Re: 230.400 bps on serial port Message-ID: <199602240232.NAA25720@genesis.atrad.adelaide.edu.au> In-Reply-To: <199602231727.KAA23715@phaeton.artisoft.com> from "Terry Lambert" at Feb 23, 96 10:27:49 am
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Terry Lambert stands accused of saying: > > > I need a reliable data transfer rate of 230.400 bps on the serial port for > > PPP. Can that be done ? getty only has a setting for 115.200 bps. I have a > > Gigabyte 586 ATEP mainboard with FIFOs. Can I use them for 230.400 bps, and > > how ? Or should I buy a special serial card for that ? > > That is MIDI speed. I wonder what you are doing? 8-). MIDI is 32K. (Yes, I owned several ATARIs and hiked the MIDI UART up to 500K for networking, but it's a 6850 and not at all up to it.) > The Intel UART parts, as much as Dennis loves them, use a clock divider > and the standard frequency for the crystal makes it impossible to get > that data rate out of the serial hardware (I assume you have an Amiga > or similar current loop converter for RS232?). You get 230,400 by doubling your crystal (~3.6) and dividing for 115,200. Quatech do a dual port card (the DS-100) with an 18MHz (10x) crystal and a jumper-selectable divider (/1, /2, /5 or /10). You would want to remove the (soldered in) 16550's and use 16650's (32-byte FIFOs) and update the sio driver to support them. > My personal opinion is that the Intel parts are utter crap. Hear Hear! > Or you could get a sound card that the sound driver supports MIDI for; > see the sound driver comments/documentation for details. All of the cheap MIDI interfaces are 6850 emulations. Wonder why? > Terry Lambert Sounds like a late night there 8) -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] Collector of old Unix hardware. "Where are your PEZ?" The Tick [[
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