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Re: woz' original "brick out" - source code , paddles

mad.scientist.jr@gmail.com wrote:

Thanks for the info - I have a couple of other questions.

1) What kind of connector is it that plugs into the II's game port on
the motherboard, and where can you find one? Is there an equivalent
Radio Shack or Mouser part # that would work for this?


www.digikey.com:
A103-ND
Mouser has same part in catalog, but lists it as none stock.

And a good cover would be:
A111-ND or A112-ND

You will have to drill a hole in one end of the cover for the cable.





2) What is the equation to figure out the uF for a cap you would need
to get it to work with a 50K pot?
I think that this is an simple RC time constant circuit designed with an onboard .022uF capacitor and an external 150k ohm variable pot in mind. 

To change the value. you need to solve
150k*.022uF = x * (y+.022uF)
where x the pot you want to use and y is the capacitance you need to add

so for 100k pot you get
y=(150k*.022uF)/100k-0.022uF
1.5*.022uF - .022uF =y
y = .011uF

for a 50k pot
y = (150k*.022uF)/50k-.022uF
y = .044 uF
This level of exactness isn't required in this circuit. Anything close should work. 





Thanks again...



As for the paddles,
connect an 150K ohm potentometer between +5v and each paddle input.
Since 100K ohm potentiometers are much more common these  days, you can
use one of those and in addition connect .01 uF cap between the paddle
input and ground to make up for the difference in resistance.  The
paddle circuit simply measures the RC time constant that varies with the
potentiometer setting.




On Oct 22, 9:38 pm, Mike Willegal <m...@willegal.net> wrote:


An early "Breakout" listing is in the redbook.  As for the paddles,
connect an 150K ohm potentometer between +5v and each paddle input.
Since 100K ohm potentiometers are much more common these  days, you can
use one of those and in addition connect .01 uF cap between the paddle
input and ground to make up for the difference in resistance.  The
paddle circuit simply measures the RC time constant that varies with the
potentiometer setting. The game port pin out is also in the red book
which can be found online in a couple of places.  Search for "Apple II
reference manual".

Regards,
Mike Willegal

mad.scientist...@gmail.com wrote:


Can anyone point me to the original source code for Woz' Integer BASIC
"Brick Out" game for the Apple II?
(or any Apple 2 BASIC or assembly program listings, for that matter, I
would like to play around with writing some pong type games on the
apple IIe)



Is "Little Brick Out" the Woz version, or is this a later remake?



Also, is there any documentation online on how you would build your
own paddles? I have built paddles for the Atari 2600 which are pretty
easy, you just need to know the pinouts and the potentiometer values.



Thanks