User`s guide

Remove the top cover and turn the drive so that the identifying number will
be at the bottom left of the analog board. The number might read 676-[]101, 676-
[]102 or 676-[]107. (ROM 3 GS users should check Q&A 007.)
If the I.D.# for the analog board is 676-[]101 or 676-[]102, use a pair of
nippers and cut out resistor R8 (located at position A2).
If the I.D.# for the analog board is 676-[]107, use a pair of nippers and cut
out resistor R39 (located at position C3).
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From: Dave Althoff
There are two capacitors which must be clipped from the board on the
DuoDisk regardless of what machine you intend to use them on. Failure to do
this can lead to very nasty failures. For instance, some copy-protection schemes
can cause the drive to start writing unexpectedly-- say, during a re-boot-- thus
trashing the disk without regard to the write-protect switch.
______________________________
From: Chet Gerhardt
I have done the capacitor removal mod with all DuoDisks I have sold and my
own DuoDisks. It is amazing that after all of this time most still have not had
the mod done.
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From: Steve Buggie
007- Will a Duodisk function correctly on my ROM 3 GS?
I have three Duodisks. The one connected to my flagship ROM 3 IIgs has had
the resistor and capacitors clipped out as recommended in a memo from Mitch
Spector. It works perfectly!
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From: Rubywand
A Duodisk may not be entirely functional connected to the usual ROM 3
"Disk" connector (i.e. the SmartPort). Users report that the system may not
start up unless a write-protected disk is inserted in the Duodisk. Apple, in
Tech Library notes #5010 and #5434, mentions these reports and says that there
is some code in the ROM 3 ROM that does not handle the interface to a Duodisk
properly. Apple's workaround is to connect the Duodisk to a drive interface card
instead of to the Smartport.