tom@astro.as.arizona.edu (Thomas J. Trebisky) (12/11/90)
From MAILER-DAEMON Mon Dec 10 14:49:00 1990 Return-Path: <MAILER-DAEMON> Received: by as.arizona.edu (4.1/1.2) id AB25846; Mon, 10 Dec 90 14:48:49 MST Date: Mon, 10 Dec 90 14:48:49 MST From: MAILER-DAEMON (Mail Delivery Subsystem) Subject: Returned mail: Host unknown Message-Id: <9012102148.AB25846@as.arizona.edu> To: <tom@afthree.as.arizona.edu> Status: R ----- Transcript of session follows ----- 550 <bob@miranda.inmos.co.uk>... Host unknown: Address family not supported by protocol family ----- Unsent message follows ----- Return-Path: <tom@afthree.as.arizona.edu> Received: from afthree.as.arizona.edu by as.arizona.edu (4.1/1.2) id AA25844; Mon, 10 Dec 90 14:48:49 MST Received: by afthree.as.arizona.edu (4.1/1.2) id AA00550; Mon, 10 Dec 90 14:48:54 MST Date: Mon, 10 Dec 90 14:48:54 MST From: tom@as.arizona.edu Message-Id: <9012102148.AA00550@afthree.as.arizona.edu> To: bob@miranda.inmos.co.uk Subject: Re: 68k Winchester controller Newsgroups: comp.sys.m68k In-Reply-To: <12919@ganymede.inmos.co.uk> References: <18713@ultima.socs.uts.edu.au> Organization: University of Arizona, Tucson, AZ I cannot get mail thru to bob@miranda.inmos.co.uk, so I am going ahead to post this. My vote for a winchester controller would be the Western Digital WD1010-00 or -05 (they also have/had a 2010 - supports ECC handling) The chip is a bit old by todays standard, but is the most common ST506 supporting chip I know of. The main trick would be building the PLL data separator. The DEC Rainbow used the 1010 in it's HD controller, and if you could track down the Tech Manual, you could find a circuit there. BTW the data rate moving a sector off a winchester is pretty ferocious - you need to use DMA or have a dedicated "sector buffer" as WD shows in their app. notes. A whole different approach that I am entertaining for my 68000 projects is to use one of the new IDE interface drives. The electrical interface is almost trivial, I think they transfer data 16 bits wide, are very compact, and a lot of bang for the buck (but if you already have a ST506 sitting around ....). I am waiting to get a tech. manual from WD decribing how to interface to one of these jobs. P.S. If you do get serious about the 1010 and need info, let me know, I would post it all now, but it's just hard to stuff all this paper into the disk drive slot here.... :-) Best of luck. Tom ttrebisky@as.arizona.edu (Internet)