Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!amdcad!sun!pitstop!sundc!seismo!uunet!skivs!dr
From: dr@skivs.UUCP (David Robins)
Newsgroups: comp.sys.apple
Subject: Re: PRODOS and CATALOG again
Message-ID: <2765@skivs.UUCP>
Date: 31 Jan 89 20:00:57 GMT
References: <8901252212.aa12020@SMOKE.BRL.MIL>
Reply-To: dr@skivs.UUCP (David Robins)
Organization: Smith-Kettlewell Eye Research Institute, San Francisco, CA
Lines: 32

In article <8901252212.aa12020@SMOKE.BRL.MIL> ART100@PSUVM.BITNET ("Andy Tefft  862-6728", 814) writes:
>I know this doesn't apply to the question exactly, but way back when
>I got my //e (a couple years before SOFTALK went down the tubes)
>Softalk published a program (by Uncle DOS I believe) which would
>read your DOS 3.3 CATALOG directly into variables. I used it to make

Actually, the article referred to was in Softalk August 1984, called
"A Catalog of Values!", by John A. Oakey.  It was designed allow
reading all the DOS 3.3 catalog info into Applesoft variables.  It was a 300
line assembly listing, with an accompanying Applsoft program.

A much simpler was was published in the CALL-APPLE publication "ALL
ABOUT DOS".  Bill Parker wrote and article entitled "CAT SCAN".  It
poked a machine language routine into memory, which called the catalog
routines in DOS, and directed the each catalog sector into an
Applesoft string, for up to 15 catalog sectors.  I have used this very
successfully to allow menu display selection of files, in a
menu-driven program.  

I did reconstruct the assembly language listing from the poked values,
and figured out how it worked by referencing "Beneath Apple DOS".  In
addition, I added some pokes to catalog from either drive, with or
without changing the drive default settings.  The program as published
does not work with DOS moved up (DOS-UP or DOS MOVER).  I did manage
to modify the program for DOS moved, however.  An exercise in
switching the language card memory in and out.

-- 
David Robins, M.D.  (ophthalmologist / electronics engineer)
The Smith-Kettlewell Institute of Visual Science,  ***  net:  uunet!skivs!dr
2232 Webster St, San Francisco CA 94115            ***  415/561-1705 (voice) 
The opinions expressed herein do not reflect the opinion of the Institute!