User`s guide

Cut the Notch Detect micro-switch leads about 1" away from the Large Connector.
Connect the Black Notch Detect, Black Large Connector, and Black Switch leads
(i.e. strip ends, solder, and cover in heat-shrink tubing or tape).
Connect the Brown Notch Detect lead to the White Switch lead.
Connect the Brown Large Connector lead to the Brown Switch lead.
Viola! Now you're ready to replace the cover, plug in the drive, and try
out your A/MWP enhanced Disk ][.
______________________________
From: Ed Eastman
Most of the time what you want to be able to do with a Write Protect
modification is turn On Write Enable when a disk is not notched. That is what
this mod for does. Details relate to the 5.25" Unidisk but the method will also
work with other Apple II 5.25" drives.
The way the write protect sensor works on newer drives is that an LED on
one side shines on a phototransistor (the sensor) on the other side. When there
is a notch in the diskette you insert, light passes through the gap and the
sensor 'closes' to complete the Write Enable circuit.
What we will do is give the Write Enable circuit an alternate enable option
using an On/Off switch. A mini toggle switch is okay; but, I like to use a small
normally-open momentary contact pushbutton switch from Radio Shack. It's
compact, looks nice, and pressing the button for the few seconds usually
required for a file, etc. write is no problem.
I normally mount the switch in the upper left part of the face plate,
opposite the light to balance the look. Drill a hole a little smaller than
required and use scissors or a larger drill to taper the hold to just where you
can screw in the switch.
Before soldering on leads and mounting the switch, decide where you want to
make the connections. You can locate the output leads from the sensor and splice
one switch lead to each; or, you can find the place on the circuit board where
the sensor leads go and connect there.
On a Unidisk you will see a large connector labeled "CN1" near the front.
Pins 9 and 11 of CN1 are the write protect sensor connections. More convenient
connection points are the circuit board edge side of R12 and the wire at J29.
Solder on leads long enough to reach the connection points and screw in the
switch. On a Unidisk, connect one switch lead to the R12 point near the edge and
one to the wire at J29.
Now when you need to override write protect on an unnotched disk, you
simply press the button while writing. Go ahead and plug in the drive and give
it a try.