Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!rutgers!cbmvax!daveh From: daveh@cbmvax.commodore.com (Dave Haynie) Newsgroups: comp.sys.amiga.hardware Subject: Re: UNIX memory consumption (was: Amiga-Sun unix question) Message-ID: <12759@cbmvax.commodore.com> Date: 15 Jun 90 21:06:24 GMT References: <2029@mindlink.UUCP> <12477@cbmvax.commodore.com> <5777@hub.ucsb.edu> Reply-To: daveh@cbmvax (Dave Haynie) Organization: Commodore, West Chester, PA Lines: 23 In article Chuck.Phillips@FtCollins.NCR.COM (Chuck.Phillips) writes: >Very true. Question: Does the C= (or any other) Amiga SCSI controller >suport "synchronous" SCSI? I seem to recall the difference in maximum >throughput being more than a factor of 3. (BTW, the Quantum 110MB drives >support this.) The A3000 controller definitely does, I don't know about the other Commodore controllers. The transfer rate is a max of about 1.5 MB/s for asynchronous SCSI, a max of around 4-5 MB/s for synchronous SCSI. The A2000 bus bandwidth is about 3.75 MB/s, the A3000 SCSI device runs about 20 MB/s. The Commodore software never requests synchronous operation, since apparently some drives that don't support it lock up when polled for it. A simple program can use the scsi.device to explicitly ask for it if you know your drive supports it. Steve Beats could supply all the ugly details. >Chuck Phillips MS440 -- Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests" {uunet|pyramid|rutgers}!cbmvax!daveh PLINK: hazy BIX: hazy "I have been given the freedom to do as I see fit" -REM