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Re: Lowercase in GSOS

Subject: Re: Lowercase in GSOS
From: dempson@actrix.gen.nz (David Empson)
Date: Fri, 26 Oct 2012 12:21:20 +1300
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<gids.rs@sasktel.net> wrote:

> Does anyone know where the lowercase letters of a files name is stored
> under GSOS?

I assume you mean on the ProDOS file system, since GS/OS supports
multiple file systems.

Apple implemented a method of storing lower case letters (and spaces) in
ProDOS filenames for Apple IIgs System 5.0 which avoided breaking
compatibility with SOS, ProDOS-8 and older IIgs system software.

The "version" and "minimum version" fields in the directory entry had
never been used for anything important and were redefined as a bitmap
which indicates whether the corresponding character in the filename is
uppercase/period or lowercase/space.

For the full details, find a copy of the Apple II technical notes, and
see GS/OS Technical Note #8 (named "TN.GSOS.008" in my copy).

-- 
David Empson
dempson@actrix.gen.nz

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