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From: fred@cbmvax.UUCP (Fred Bowen)
Newsgroups: comp.sys.cbm
Subject: Re: 1581 - Review & Questions
Message-ID: <2372@cbmvax.UUCP>
Date: Mon, 21-Sep-87 16:40:34 EDT
Article-I.D.: cbmvax.2372
Posted: Mon Sep 21 16:40:34 1987
Date-Received: Wed, 23-Sep-87 01:15:25 EDT
References: <14031@amdahl.amdahl.com> <927@s.cc.purdue.edu> <733@uokmax.UUCP>
Organization: Commodore Technology, West Chester, PA
Lines: 30
Keywords: 1581 3.5 inch disk drive commodore c64 (64?)

This is a re-posting of something I originally posted last Friday after a
system crash- the system date was fubar, and you may not have seen it.

> > > 4. The drive has the capability of automatically loading a file
> > >    into one of it's buffers, and executing that program upon
> > >    drive initialization. This is documented in the 1581 manual. I
> > >    know that this feature was also on the 1541, but undocumented.

Yes, the 1581 has an "autoload" feature, based upon the utility loader
feature that is found in the 1571 (lookup "utility loader" in the index).
The utility load feature is not found on the 1541, although the whole scheme
is based upon USR type files which, of course, do exist on the 1541.

On the 1571, USR type files can be loaded into DOS memory via the "&"
command  ( OPEN1,8,15,"&0:FOO" ).  The 1581 carries this one step further
by adding an "autoload" feature- if the USR filename is COPYRIGHT CBM 86
then, upon drive initialization (e.g., turn it on with disk installed, or
send via the command channel an "I" or "UJ", Burst Query, or Burst Inquire)
that file will automatically be loaded into DOS RAM *and* executed.

Hope this helps- the various manuals do explain this stuff pretty well. I'll
be glad to go into this further if you are still interested...

--
-- 
Fred Bowen			uucp:	{ihnp4|rutgers|caip}!cbmvax!fred
				arpa:	beats me
				tele:	215 431-9100

Commodore Electronics, Ltd.,  1200 Wilson Drive,  West Chester,  PA,  19380