Path: utzoo!attcan!uunet!mcsun!unido!tub!tmpmbx!netmbx!hase
From: hase@netmbx.UUCP (Hartmut Semken)
Newsgroups: comp.sys.atari.st
Subject: Re: High density Floppies on ST
Message-ID: <3838@netmbx.UUCP>
Date: 25 Nov 89 16:57:46 GMT
References: <1345@uvm-gen.UUCP> <1346@uvm-gen.UUCP>
Reply-To: hase@netmbx.UUCP (Hartmut Semken)
Organization: netmbx Public Access Unix, Berlin, West Germany
Lines: 28

In article <1346@uvm-gen.UUCP> pegram@uvm-gen.UUCP (pegram r) writes:
>
>Rats! I looked up the possible seek rates last night, 6 msec is as slow
>as she goes.

Hmm, TOS will step at 6,12,2,3 msec (with rate codes 0,1,2,3).
Setting the controller to 6 msec and doubling the clock works for almost
all 3.5 inch HD drives.

>It would also be hard to boot from a floppy with this
>mod (double - 16Mhz - clock for 1772 + formatter + "6"msec seek rate).
>Do you have to have a seek rate setting boot sector on every boot
>floppy and would that idea even work?

Sure, that should work, since nosteps schould be necessary to read the
boot sector.
I boot from harddisk...

If the HD-floppy does not work after modifying the ST, the step pule
width is a probable cause.
In that case, use an edge-triggered monoflop to "resize" the pulse.

hase
-- 
Hartmut Semken, Lupsteiner Weg 67, 1000 Berlin 37 hase@netmbx.UUCP
Dennis had stepped up into the top seat whet its founder had died of a
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