If the cassette out is line level then you could easily rewrite programs 
without source code by doing a search for the speaker address and 
changing it to the cassette address using a sector editor.  Search for 
$30 c0 (the speaker memory address in lo-high order) and change the $30 
to a $20.  This works quite well for a lot of games according to many 
things I've read.  Someone should check the circuit diagram and see how 
well the impedence, current and voltage would do to drive a line level 
input.

Warning, your mileage may vary:

Years ago, I took the speaker on my II+ and put a volume control in 
series and a small stereo speaker jack appropriately wired.  Sorry I do 
not know the ohm rating of the volume.  I experimented with parts I had 
handy and picked the one that gave the the best range from maximum to 
practically muted.  It never fully muted.

Connections:
*  +5 to one end of volume
*  middle volume (wiper) to tip of Headphone jack.
*  Headphone switch of the jack to Speaker.
*  'other tip' of headphone jack to the other side of the speaker. (so 
the sound would go through stereo headphones with a stereo plug)
*  No connection on the common jack connector or the other end of the 
volume control.

I distinctly recall using that speaker jack to hook into a boombox and 
it worked, although the volume level was never very high and the 
distortion and noise were in abundance.

This circuit was transplantable and I loaned it to a friend's with a IIe 
for a week or so before permanently mounting it in my II+.

Now that I know a bit more about electronics, I realize a capacitor 
would have helped quite a bit to decouple the currents and smoothed a 
lot of the noise.  I also realize that I could have blown up the aux 
circuit in my boombox.

Thankx,
Ed

Mike Pfaiffer wrote:
> Simon Williams wrote:
>> Anyone tinkered with replacing the IIe's crappy speaker with a line out?
> 
>     For programs where the source was available I used to change the 
> output from the speaker to the casette out. This I safely sent to my 
> guitar amp and stereo.




Mike Pfaiffer <mike@digitalcivilization.ca> wrote:
> 	For programs where the source was available I used to change the output 
> from the speaker to the casette out. This I safely sent to my guitar amp 
> and stereo.

For programs where the source is *not* available you can usually just
search and replace "ad 30 c0" with "ad 20 c0".

Not guaranteed to work, and it might break something, but it's worth
a shot (and a whole lot safer than rewiring your computer).

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Simon Williams (originally) asked:

>Anyone tinkered with replacing the IIe's crappy speaker with a line out?
>I'm a little hesitant to connect the wires up to my stereo without first
>hearing from someone who's already been electrocuted =8-O

Although several approaches to this modification have already been
suggested, another was recently brought to my attention by Howard
Katz, who read in an Apple II mag (A+ or Incider?) several years ago
and for whom it works flawlessly.

It has the advantage of delivering a line-level signal (about 1.8 volts) at
reasonable impedance (a few thousand ohms) that is referenced to
Apple ground.  And unlike signals tapped from the speaker side of the
Darlington driver, it is free of distortions caused by speaker inductance.

The idea is to tap the audio drive signal across diode CR4, near the
speaker output on the main board.  The anode of this diode is ground,
and the cathode is the desired signal.  (The cathode is the end of the
diode nearest the black band.)

The tap can be done with miniature clip leads or Minigrabbers so that
no soldering is required.

The ground side should connect to the shield of a cable with an RCA
plug (or to the ground side of a female RCA connector), and the signal
goes to the inner wire (or the central socket of the RCA connector).

This output is suitable for any amplifier or amplified speaker.

-michael

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Home page:  http://members.aol.com/MJMahon/