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jack box.txt
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2000-01-15
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4KB
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69 lines
+---------------------------------------------------------------+
| You have received this information courtesy of .neXus. We do |
| not claim to be hackers, phreaks, pirates, traitors, etc. We |
| only believe that an alternative to making certain info/ideas |
| illegal as a means to keep people from doing bad things - is |
| make information free, and educate people how to handle free |
| information responsibly. Please think and act responsibly. |
| Don't get cockey, don't get pushy. There is always gonna be |
| someone out there that can kick your ass. Remember that. |
| |
| Keep the net connected......... - .gKo. |
+---------------------------------------------------------------+
--------
JACK BOX
--------
Ma Bell is not the only one with standards! Just about every
manufacturer of ic's that generate touch tones has also gone by
the 16 key (8 tone) standard for touch tone pads, and it is even
easier to convert a tone pad that uses an integrated circuit to
generate the tones than converting a Ma Bell pad!
It will help immensely if you have the schematic for the pad in
question, or at least the pin-out diagram of the chip being used.
Pin-outs can usually be obtained from the manufacturer or from an
ECG, SK, GE or similar semiconductor handbook (provided that
manufacturer makes an equivalent for the chip in your pad). I'll
use the Radio Shack cex-4000 tone pad module for an example, even
though it is probably almost the lousiest one you can buy, it is
fairly typical easily available.
Take a look at the diagram or the pin-out of the chip. You should
see two groups of pins, the rows tone pins and the column tone
pins. These will be marked as r1,r2,r3,r4 and c1,c2,c3 (Radio
Shack) or or x1,x2,x3 and y1,y2,y3 etc. on others. At any rate
you should be able to distinguish which three pins control the
columns and which four control the rows. If you're lucky, each
group of rows and columns will be contiguous. Now look at the
column pins, and you'll probably see an empty pin right next to
them. This is the column pin for the 1633 hz tones. These chips
usually achieve their switching by connecting a row pin with a
column pin (that way they can use a simple keyboard pad, unlike
Ma Bell's complicated one). So all you have to do is take a spdt
switch and a few pieces of wire, cut the trace going to the
column 3 pin of the chip, attach a wire from the chip side of
that cut to one end of the spdt switch, a wire from the other
side of the cut to the center of the spdt switch, and finally,
from the remaining contact on the spdt switch, hook a wire to the
previously identified pin c4 (column 4). Now you have a "bank
switching arrangement exactly like the one described in the pre-
vious bulletin for modifying a ma bell pad.
If you can't get the schematics or the pin outs for your chip,
don't despair. There is still hope for you! You just have to
track the connections going from the pad's keys to the chip.
Chances are you'll find that each row has a common trace, and so
does each column (for those non-technical folks, a trace is a
connection etched out on a circuit board). Just follow these to
the chip, and make your own schematic up. Now take a look for
that extra pin--there should be one floating around right next to
the column pins. It will be not be hooked up to anything else,
that is, "hanging free". Drill a hole in the side of tonepad's
case, and mount your switch. Radio shack sells a nice microminia-
ture switch that works excellently!
+++EOF