Date: Tue, 28 Nov 1995 07:52:38 -0500 (EST) From: Peter Dufault <dufault@hda.com> To: joerg_wunsch@uriah.heep.sax.de Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Anyone keen to help me get a Phillips CDD 521 Recorder working? Message-ID: <199511281252.HAA08317@hda.com> In-Reply-To: <199511272240.XAA07448@uriah.heep.sax.de> from "J Wunsch" at Nov 27, 95 11:40:05 pm
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> > > > I'll checkout rtprio, and I'm sorry I don't have all the specifics > > right now (you can probably find them at http://www.cdarchives.com) but > > the Yamaha is a 4X writer with only 512k buffer. > > 4times, 6times -- what's the base for the comparision? The unit is a single speed CDROM at 150K/s. So this 4X driver is 600K/s, so you have under a seconds data in the FIFO. (This makes more sense than the frame grabbers that I've seen advertised that operate at "twice real time".) > The SCSI bus itself can transfer about 8 MBytes/s continuously (on a > "standard" 8-bit controller, like the AHA-2940 or NCR 53c810). How > close do these burners come to that value? They hopefully burst into their RAM buffers at this speed to give you the latency you need to go read another chunk. -- Peter Dufault Real Time Machine Control and Simulation HD Associates, Inc. Voice: 508 433 6936 dufault@hda.com Fax: 508 433 5267
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