Path: utzoo!utgpu!watmath!clyde!att!rutgers!cmcl2!phri!cooper!dasys1!pechter From: pechter@dasys1.UUCP (Bill Pechter) Newsgroups: comp.sys.att Subject: Re: Harddisk on M24/AT&T 6300 Message-ID: <8049@dasys1.UUCP> Date: 2 Dec 88 11:53:32 GMT References: <1233@dutesta.UUCP> Reply-To: pechter@dasys1.UUCP (Bill Pechter) Organization: Datamerica Systems, NYC Lines: 37 Summary:Interleave of three possible In article <1233@dutesta.UUCP> franky@dutesta.UUCP (Frank W. ten Wolde) writes: > > >I would like to know your (NetLanders) opinion about the following: > >I have a AT&T 3600 (actually Olivetti M24) computer and a Seagate >harddisk (ST251-1) using a Western Digital Controller (WD1002S-WX1). >For optimum results I must set the interleave factor to 5, which >slows down the data transfer rate (disk<-->host) to appr. 100K per >second. > > 1. Is there someone out there who has the same problem? We all do. The bus on the 6300 runs at 4mhz which is quite slow. If you use the on-disk controller bios rom you get a very slow transfer rate and interleave. > 2. Is there someone with an AT&T 3600 with a data rate > of 170K/s (and a corresponding interleave of 3)? I've got a transfer rate of 173k and an interleave of three. I'm running a V30 processor, the 1.43 bios rom to control disk parameters and qfresh. Before qfresh I got an interleave of 4 and 130k. My best interleave on the WD Superbios Rom was 6. Some people have had luck with a program called Ramit that loads the disk controller bios into Ram. I haven't had much luck with it. > 3. Is there someone who can tell me where the problem > originates and perhaps how to solve it? The bus board's the main problem and it's hardware. The above workarounds should help. I wish someone built an AT&T 16 bit bus disk controller!. ------------------------------------------------------------------------------- Bill Pechter {sun!hoptoad,cmcl2!phri}!dasys1!pechter USnail 103 Governors Road, Lakewood, NJ 08701 AT&T 201-370-0709 Evenings "When in doubt, swap it out." " Anyone want a PDT11/150?" -------------------------------------------------------------------------------