User`s guide

Old "in Use" LED- pop off the retainer ring and push through the
LED. Leave the LED mount in the hole. Cut off the LED, spread
cable ends and tab over with cellophane tape. (Put old LED and
ring into parts box.
Spread apart retainer 'leaves' of LED mount (at back side of panel)
to permit easier insertion of new 3-lead LED.
Run LED + cable over back of board and along bottom toward the
hole in the front panel. Push through hole. (If hole is too small,
use a Dremel tool and steel 'bulb bit' to slightly enlarge front
part of hole.)
connect LED cable black to free end of Rcath
connect LED cable green to Emitter of Qgreen (right transistor)
connect LED cable red to Emitter of Qred.
position old LED cable beneath new LED cable.
connect a wire from the free end or Rgreen (on IC pin-1) to the
Base lead of transistor Qgreen.
connect a wire from the free end or Rred (on IC pin-6) to the
Base lead of transistor Qred.
Add epoxy to the back of the LED and holder to secure the LED.
How it Works
When /Enable goes low to select the Drive, the power transistor (Q1)
switches ON and supplies +12V at its Collector. If there is no Write, 74121
output /Q is high, Qgreen conducts, and the LED shows Green. That is: the Green
LED will light during boots and for any READs.
If the Drive is selected (/Enabled is low) and there is a Write operation
and Write Protect is not ON, then, the /Write Request signal at 74LS125 pin 8
will go low. This triggers the 74121 One-Shot (at pin 3) producing an aprox.
160ms pulse at 74121 output Q. For the duration of the pulse, /Q is low and Q is
high. Qred conducts, and the LED shows RED to indicate WRITE.
______________________________
From: Dan DeMaggio
020- What's the scoop on the 3.5" High Density drive?
In order to do High Density on the Apple II, you will need both the High
Density 3.5" drive and the Apple 3.5" HD controller. If you don't have both, you
will only be able to do regular density. Of course, you will also need High
Density diskettes.
Once you have collected the above items, you are in for a pleasant
surprise. ProDos 8 programs not only recognize it, but most programs format and