Article View: comp.sys.atari.st
Article #5546Re: External 360k 5.25" floppy
From: C.L. Freemesser
Date: Sat, 11 Nov 1989 03:27
Date: Sat, 11 Nov 1989 03:27
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In article <1989Nov10.062019.19498@rpi.edu> vicc@unix.cie.rpi.edu () writes:
>I've got a 5.25" floppy w/cable to connect to the ST. How do I get the
>ST to use the drive? Is it a TOS porblem (I've got an oldish system
>but I don't know what version of TOS - certainly not 1.4) The drive
>spins when I access B: even though it asks for a disk in A: so
>something is going right.
>
There are a few things you have to do to get it to work:
1) Remove the resistor terminator pack
2) Track down a 150 Ohm resistor that's tied to the +5V line. This
resistor brings the voltage down to 2.5V when the drive is called.
However, the Atari needs it to be 0V. Replace it with a 1K Ohm
resistor.
3) Get a copy of the PCF554.PRG program. You have to slow down
the access to drive B (the 5.25 inch drive) to 6ms. It cannot
reliably access the drive at 3ms.
You'll also have to use a program like DC Format 3.02 to format the
disks. You cannot format them using the desktop. Also, you will have
to mess with the different jumper blocks on the board to find the
correct configuration.
Chris Freemesser, Rochester Institute of Technology :BITNET:%clf3678@RITVAX
||| ____________ :GEnie: C.FREEMESSER
||| /___ / (and 8-bit too!) :USENET: Don't bother,
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Call the A.C.O.R.N BBS (716)436-3078, 300/1200 baud :<-or my BBS
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!udel!rochester!rit!ultb!clf3678 From: clf3678@ultb.UUCP (C.L. Freemesser) Newsgroups: comp.sys.atari.st Subject: Re: External 360k 5.25" floppy Summary: How to build one Message-ID: <1602@ultb.UUCP> Date: 11 Nov 89 03:27:56 GMT References: <1989Nov10.062019.19498@rpi.edu> Reply-To: clf3678@ultb.UUCP (C.L. Freemesser) Organization: Rochester Institute of Technology, Information Systems Lines: 29