Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site brl-tgr.ARPA Path: utzoo!linus!decvax!ucbvax!ucdavis!lll-crg!gymble!umcp-cs!seismo!brl-tgr!tgr!STANLEY@USC-ECLB.ARPA From: STANLEY@USC-ECLB.ARPA Newsgroups: net.micro.cpm Subject: Re: A way to read 48 tpi disks on 96 tpi drives? Message-ID: <2041@brl-tgr.ARPA> Date: Thu, 10-Oct-85 13:00:13 EDT Article-I.D.: brl-tgr.2041 Posted: Thu Oct 10 13:00:13 1985 Date-Received: Sat, 12-Oct-85 07:34:54 EDT Sender: news@brl-tgr.ARPA Lines: 42 Received: from AMSAA.ARPA by USC-ECLB.ARPA; Thu 10 Oct 85 05:19:47-PDT from brl-tgr.arpa by AMSAA.ARPA id aa20215; 10 Oct 85 7:34 EDT from usenet by TGR.BRL.ARPA id a029617; 9 Oct 85 18:51 EDT Date: 5 Oct 85 16:37:40 GMT From: ir320 To: info-cpm@AMSAA.ARPA Subject: A way to read 48 tpi disks on 96 tpi drives? Return-Path: Message-ID: <2229@sdcc6.UUCP> Newsgroups: net.micro.cpm Hello netlanders, I am getting a new computer and need to decide whether to get 96 tpi drives or 48 tpi drives. I know I get double the storage with 96 tpi, but I also give up disk compatability with them don't I? Is there a way I could read/write a 48 tpi disks on a 96 tpi machine. (The system is question is the new SB180 system described in Byte.) Can other systems write disks for these drives? John Antypas UC San Diego uucp: ...!{ ucbvax, decvax, ihnp4, noscvax, bang}!sdcsvax!sdcc6!ir320 arpa: ir320%sdcc6@sdcsvax.ARPA sdcsvax!sdcc6!ir320@Berkeley.ARPA -------------------- John, You can read 48 tpi disks on 96 tpi drives by double-stepping the head for each track; Heath H89's have been doing this for a long time. Writing in 48 tpi from a 96 tpi drive is another thing. I've been told it can be done, and have seen it happen occasionally on an IBM PC/AT, but my experience tells me it is a very dicey business. Reading can be done dependably, but not writing. ...Dick Stanley