Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!gem.mps.ohio-state.edu!uakari.primate.wisc.edu!xanth!mcnc!rti!sunpix!matthew
From: matthew@sunpix.UUCP ( Sun Visualization Products)
Newsgroups: comp.sys.apple
Subject: Re: ProDOS error
Message-ID: <998@friar-taac.UUCP>
Date: 15 Nov 89 16:44:00 GMT
References: <3947960@ub.cc.umich.edu>
Reply-To: matthew@friar-taac.UUCP (Matthew Stier - Sun Visualization Products)
Organization: Sun Microsystems, RTP, NC
Lines: 47

In article <3947960@ub.cc.umich.edu> Tabakal@UB.CC.UMICH.EDU writes:
}Okay, just checking out a new (well, new to my archive) version of Zlink
}and trying to download more utilities from a new BBS (two birds with one
}stone)...
} 
}Anyway, I keep getting ProDOS error $56.  This is not defined in
}Michael Fischer's ][gs tech. reference book.  What does this error
}mean and how can it be gotten around.  I disable my ProDOS 8 write
}protect CDA, but I can't save any files (including the buffer) to
}disk.  Dave Whitney, what do you think?
} 
}-----------------------------------------------------------------------------
} 
}    Todd A. Bakal                              I believe in the Cubs,
}    U of M Apple User's Group                  Bo's national championship
}    Ann Arbor, Michigan                        chances, and my Apple ][gs. 
} 
}    Internet: Tabakal@ub.cc.umich.edu          FTP: 35.1.1.43
}    UUCP: ...!uunet!ub.cc.umich.edu!tabakal    BITnet: Tabakal@UMICHUB




Whipping out my trusty "Beneath Apple ProDOS (Quality Software)", I quote:

$56	The address of the I/O file buffer passed to OPEN or
	SET_BUF is invalid.  The buffer overlaps a previously
	assigned buffer, memory below $200, or ProDOS itself.
	The buffer must be in the caller's memory, and all four 
	of its pages must be marked free in the Systems Global
	Page memory bit map.

end quote.

In other words, the 'address of file buffer' in an OPEN, GET_BUF or SET_BUF
MLI call is in conflict with the Systems Global Page memory bit map.






-- 
Matthew Lee Stier                            |
Sun Microsystems ---  RTP, NC  27709-3447    |     "Wisconsin   Escapee"
uucp:  sun!mstier or mcnc!rti!sunpix!matthew |
phone: (919) 469-8300 fax: (919) 460-8355    |