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From: aliu@nunki.usc.edu (Alejandro Liu)
Newsgroups: comp.sys.cbm
Subject: Re: Side "H1" of a #1571 Disk.
Summary: 1571 acting as 1541 is Slow
Keywords: U0>M0 = 1541 = Slow Drive
Message-ID: <2470@nunki.usc.edu>
Date: 26 Jan 89 04:41:55 GMT
References: <317@hal.UUCP>
Reply-To: aliu@nunki.usc.edu (Alejandro Liu)
Organization: University of Southern California, Los Angeles, CA
Lines: 18

In article <317@hal.UUCP> hxh@hal.UUCP (Howard Hermann) writes:
>material,  (and with a lot of help), and using U0>M0, and U0>H1, and HEADER, I
[Some Stuff deleted]
>run  into, however, is that of loading these programs from side H1.  A program
>that  loads in 4 seconds from a #1581, or a double-sided formatted #1571 disk
>now takes over 32 seconds to load, from side H1, of this two-sided disk.  [The

The problem here is that when you use U0>M0, you are actualy setting
your 1571 to 1541 emulation, thus disabling the Serial Fast Mode.  If
you want to take full capability of your drive, you must not use U0>M0
but U0>M1, this puts your 1571 in native double sided mode, but the
drive recognizes disk that are single sided.  Thus doing what you
wanted to do without this 1541 slower speed mode.

-- 
 
                    aliu@nunki.usc.edu (Alejandro Liu) 
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