Path: utzoo!attcan!uunet!mailrus!cs.utexas.edu!usc!zaphod.mps.ohio-state.edu!tut.cis.ohio-state.edu!att!dptg!lzsc!hcj
From: hcj@lzsc.ATT.COM (HC Johnson)
Newsgroups: comp.sys.atari.st
Subject: Re: 5.25" drive problems on the STe
Summary: STe, TOS1.4 TOS1.6 fix it for you this way
Message-ID: <1428@lzsc.ATT.COM>
Date: 15 Mar 90 15:28:47 GMT
References: <2734@erix.ericsson.se> <1990Mar14.210209.21517@sun.soe.clarkson.edu>
Organization: AT&T BL Middletown/Lincroft NJ USA
Lines: 35

In article <1990Mar14.210209.21517@sun.soe.clarkson.edu>, opielask@clutx.clarkson.edu (,,,2684025) writes:
> From article <2734@erix.ericsson.se>, by euaanu@eua.ericsson.se (Arto Nummelin):
> > I'm trying to connect a 5.25" 360k drive to my 520STE (now expanded
> > to 2M with 1M SIMMs). The problem is (I guess) that the step rate
> > is to high so the drive can't step as fast as required. How can I lower
> > the step rate? I saw someone mention a program to put in your
> > auto folder. Does anybody have this program? If so, please e-mail me
> > a copy.
> 
> I have an INDUS GT-1000 external 5.25" drive, and my 1040STe hates it.
> The booting software that came with the drive won't work on the STe.
> And Future Systems (the makers of the drive) knew nothing about it.
> They were nice enough to send me another program that they thought might
> help, but no...
> 
TOS 1.4 and TOS 1.6 (STe) have added a BIOS call to change the floppy
seek rate without punching numbers into memory.

	XBIOS function 41
	oldrate = Floprate(devno,newrate);
	short devno,newrate;
	devno is 0=a 1 =b; newrate=1 12MS, the slowest for 5.25 drives.

MWC assembler:
	move.w	$1, -(a7) / slowest
	move.w	$0, -(a7) / or use $1 if drive B:
	move.w	$41,-(a7)
	trap	0x14
	addq.l	$6, a7


Howard C. Johnson
ATT Bell Labs
att!lzsc!hcj
hcj@lzsc.att.com