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Re: Connecting DUODisk to ROM3
Okay, I took the cover off my DUO Drive to take a look at it.. the
model number I have is 76-0107-B which doesn't match what is said in
the FAQ. Does that mean I do not have to snip any thing (side note: I
don't have a C30. I have a C29, but it's not in the location where the
FAQ states).
Also R39 is already missing. But this still doesn't answer if this
will work in a ROM3 GS...
Thanks in advance for any help on this. :D
-Locutus
In article <251220001823088171%locutus@locutus.org>, Locutus
<locutus@locutus.org> wrote:
> Since I am having a hard time getting a DUODisk (or simular) card
> cheap for my DUO Drive I saw this that will help it work on a ROM 3 GS.
> I've also read that this drive does not work on a ROM 3 GS because how
> the drive works on IDing drives connected to it.
>
> Can any one confirm if I make these mods will help? Or should I do
> the mods anyways?
>
> EXCERPT FROM THE FAQ
>
>
> From: Steve Jensen
>
> 006- What DuoDisk mods are necessary?
>
> The following is excerpted from an info file from my old bbs ...
>
> There are TWO modifications that should be made to Duodisk drives:
>
> The First one was recommended by Apple several ago to solve
> occasional problems with trashing diskettes. The solution is to remove
> 2 capacitors.
>
> The Second modification is only required to solve a problem with
> daisy-chaining on the GS Smartport, though the modified Duodisk will
> still work fine on older Apple II's. It requires removing a resistor.
>
>
>
> DUODISK MODIFICATION #1- REMOVAL OF TWO CAPACITORS
>
> This mod should be done on ALL Duodisks, no matter whether they're
> used on //e's, IIGS's, etc. The problem was that diskettes would
> sometimes be damaged when doing an Open-Apple-CTL-Reset or when using
> disks with certain kinds of copy protection. The mod was in an Apple
> dealer service bulletin several years ago for "analog board PN
> 676-[]101 or 676-[]102."
>
> The Analog board is the one inside Drive 1 in the Duodisk. You
> may have to unplug the cable near the back right of the board to see
> the board's model number. Anyway, if you have the -101 or -102 board,
> just snip out Capacitors C29 and C30 at board locations A1 and B1,
> respectively.
>
>
> DUODISK MODIFICATION #2- REMOVAL OF A RESISTOR
>
> This mod should be done for Duodisks used with a GS; otherwise, it
> is optional. The problem is that the Duodisk draws just a little too
> much current when connected to the GS Smartport. This can render other
> drives on the chain inoperable. Problems are MOST likely to occur when
> the Duodisk is daisy-chained from a Unidisk 3.5 Drive.
>
> 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.
>
> 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 A1).
>
> ----------------------------
>
>
> 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.
>
>
> ____________________________
>
>
>
> 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!
>
> ____________________________