🚀 go-pugleaf

	I've been having trouble with my ST disk drive recently.  The problem
is that it would read fine, but cause the system to lock up anytime a write is
tried.  The system boots up and reads disks (and writes to the ram disk) fine,
but if I try to write to a disk, the drive activity light lights up, the drive
spins, and then the screen goes white.  I must then reset the system to get
things going again.  The system seems to actually write one sector (if I try to
create or rename a file, the system will crash, but the creation or renaming
will be there on the disk next time that I bring the system up.)

	I have the following configuration:

		520ST with 1Meg memory upgrade with 68 ohm resistors
		1 Single sided disk drive
		Color monitor
		TOS on disk
		Older brick power supply with one cord coming from each end

	Checking the power supplies has revealed the following:

		Voltages coming to the disk drive are fine
		+/-12 Volt supplies to system unit are fine
		+5 volt supply to system unit is +5.33 Volts under load

	I do not have easy access to someone else's 520ST system to try
	different pieces in (they don't seem to be real popular here).

My question is if anyone has any suggestion of what to do.  Specifically,
could a 5V supply supplying 5.33 cause a problem (I realize that 7400 series
IC's are rated only to 5.25, but the rest of the system is working, after
all).  Is there maybe an RC circuit in the floppy controller that is real
sensitive to voltage variations?  Or is it maybe just a dirty disk drive
?  Any ideas on things to try would be appreciated.  Also, does anybody know
what Atari does if someone tries to send a 1Meg upgrade 520St for warranty
repair work.  Do they fix it under warranty, fix it but charge you, or refuse
to even look at it?

	Any help would be appreciated.


						Joe Augenbraun

"Let's go commit those crimes!"
"Ya, yah, let's get Sushi and not pay"
		- from the movie _Repoman_