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- From: liblit@cs.psu.edu (Benjamin R. Liblit)
- Subject: PFS: File (was Re: stupid floppy tricks)
- In-Reply-To: hoffberg@medusa.aps.anl.gov's message of Tue, 17 Nov 1992 17:08:41 GMT
- Message-ID: <BxvHws.Fvq@cs.psu.edu>
- Sender: news@cs.psu.edu (Usenet)
- Nntp-Posting-Host: waldo.cs.psu.edu
- References: <1992Nov17.170841.6298@mcs.anl.gov>
- Date: Tue, 17 Nov 1992 18:26:46 GMT
- Approved: my mommy said I could
- Lines: 36
-
- In article <1992Nov17.170841.6298@mcs.anl.gov>,
- hoffberg@medusa.aps.anl.gov (Mike G. Hoffberg) writes:
-
- > OK, for all of you people out there with Apple ][ disk drives, why
- > don't 5.25" High Density disks work in the drives?
-
- Just think about the density of information you're dealing with here.
- Even if you could produce the proper signals in the write head, you
- couldn't lay them down on the disk surface accurately enough. It
- would be like trying to type by hitting the keys with a basketball.
-
- (Disclaimer: I don't particularly know what I'm talking about here.)
-
- ObHack....
-
- Aeons ago, I was hired on my a medical research organization in NYC to
- transfer patient records onto their new VAX. The old records were
- maintained on an Apple ][+, using "PFS: File". Well, this was back
- before anyone had even *thought* of the idea of cross-product
- compatibility, and PFS: was using a highly proprietary disk layout,
- with no facilities for export to other formats. I tried for weeks to
- figure out how their data was encoded.
-
- Then I got a clue. Proprietary or not, PFS *had* to decode the
- information to send it to a printer. After all, a printer's a
- printer, and they all take data (more or less) the same. So I took a
- serial cable and plugged it into the back of the Apple ][+ as though
- it led to a printer. Instead, I ran the other end right into the VAX
- as though it was coming from a terminal. Told PFS to print all the
- patient records; told the VAX to log all activity coming down the
- serial line. After that, it was a simple matter to parse the captured
- reports into a format easily understood by their VAX-end databases.
-
- --
- Ben Liblit ----- "Fais que tes reves soient plus longs que la nuit."
- liblit@cs.psu.edu -- brl102@psuvm.psu.edu -- brl102@psuvm.bitnet
-