From: utzoo!decvax!ucbvax!info-cpm
Newsgroups: fa.info-cpm
Title: Floppy Disk Warning!!!
Article-I.D.: ucbvax.373
Posted: Thu Dec 16 04:02:18 1982
Received: Tue Dec 21 21:52:43 1982

>From Gumby.MIT-OZ@BRL  Tue Dec 14 01:45:40 1982
To: Jerry E Pournelle <POURNE@Mit-Mc>
Cc: info-cpm@BRL
Via:  Mit-Mc; 12 Dec 82 17:28-EST
Via:  Brl; 12 Dec 82 17:49-EST
Via:  Brl-Bmd; 12 Dec 82 17:52-EST

    Date: 12 December 1982 02:53-EST
    From: Jerry E Pournelle <POURNE@Mit-Mc>

	    Query: does anyone have a program that will cause the
    heads to load although nothing is being read?  This to allow use
    of head cleaning disks.  I suppose this might be specific to the
    controller used?  I have a CompuPro Disk One in two separate
    machines (8085/8088 and z-80).  It's nt simple to get them to
    clean the heads, or is it?

It's surprisingly simple. You can write a simple basic program or just
do it interactively. Look up the controller IO addressses in your manual
and then look up which numbers cause the heads to seek to track 77. You
can then just do OUT xx,yy for the appropriate values of xx and yy. be
careful about hax and decimal! your manual will probably give you the
numbers in HEX or OCTAL! Either convert them yourself or have basic do
it for you.