User`s guide

6 7
7 19
8 20
9 8
10 12
11 15
12 16
13 17
14 18
15 5
16 24
17 11
18 3
19 6
______________________________
From: Steve Jensen and Jonathan Adams
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.