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From: hase@netmbx.UUCP (Hartmut Semken)
Newsgroups: comp.sys.atari.st,comp.sys.atari.st.tech
Subject: Re: Setting Floppy Seek Rate in all TOS versions
Keywords: seekrate steprate
Message-ID: <2121@netmbx.UUCP>
Date: 23 Mar 91 07:25:09 GMT
References: <1991Mar19.044454.24718@jato.jpl.nasa.gov>
Organization: netmbx, Berlin, West Germany
Lines: 23

vsnyder@jato.jpl.nasa.gov (Van Snyder) writes:

>Here's the poop on setting the seek step rate for floppies, from page 60
>of the Rainbow TOS distribution:

>"Floprate:      -  Floprate, XBIOS function 41, checks or sets the seek
>                   rate for a floppy drive.  This is new; the seek rate
>                   must be set with (previously) undocumented variables
>                   on earlier versions of TOS.

This is true if You want to set different seek rates for both drives.
If You want to set both drives to te same seek rate, place the new seek
rate in adress 0x440 (zero: six, 1: 12, 2: 2, 3: 3 milliseconds) and
call the function pointed to by the vector in adress 0x46A (hdv_init).
This will make new Bios parameter blocks for both drives and tel TOS to
use the new seek rate.
Works on all TOS versions, cause it uses only documented system
variables.

hase
-- 
Hartmut Semken, Lupsteiner Weg 67, 1000 Berlin 37 hase@netmbx.UUCP
Hi! (Zaphod Beeblebrox)