49 lines
3.0 KiB
Plaintext
49 lines
3.0 KiB
Plaintext
*** Solid State Silver Boxes ***
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From Jack's Hack 1.0
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Ma Bell is not the only one with standards! Just about every manufacturer of
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IC's that generate touch tones has also gone by the 16 key (8 tone) standard
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for Touch Tone pads. And it is even easier to convert a tone pad that uses an
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integrated circuit to generate the tones than converting a Ma Bell pad!
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It will help immensely if you have the schematic for the pad in question, or at
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least the pin-out diagram of the chip being used. Pin-outs can usually be
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obtained from the manufacturer or from an ECG, SK, GE or similiar semiconducter
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handbook (provided that manufacturer makes an equivalent for the chip in your
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pad). I'll use the Radio Shack CEX-4000 tone pad module for an example, even
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though it is probably almost the lousiest one you can buy, it is fairly typical
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and easily available.
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Take a look at the diagram or the pin-out of the chip. You should see two
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groups of pins, the rows tone pins and the column tone pins. These will be
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marked as R1,R2,R3,R4 and C1,C2,C3 (Radio Shack) or X1,X2,X3 and Y1,Y2,Y3 etc.
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on others. At any rate, you should be able to distinguish which three pins
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control the columns and which four control the rows. If you're lucky, each
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group of rows and columns will be contiguous. Now look at the column pins, and
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you'll probably see an empty pin right next to them. This is the column pin
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for the 1633 hz tones. These chips usually achieve their switching by
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connecting a row pin with a column pin (that way they can use a very simple
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keyboard pad, unlike Ma Bell's complicated one). So all you have to do is take
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a SPDT switch and a few pieces of wire, cut the trace going to the column 3 pin
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of the chip, attach a wire from the chip side of that cut to one end of the
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SPDT switch, a wire from the other side of the cut to the center of the SPDT
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switch, and finally, from the remaining contact on the SPDT switch, hook a wire
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to the previously identified pin C4 (Column 4). Now you have a "bank switching
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arrangement exactly like the one described in the previous bulletin for
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modifying a Ma Bell pad.
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If you can't get the schematics or the pin outs for your chip, don't despair.
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There is still hope for you! You just have to track the connections going from
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the pad's keys to the chip. Chances are you'll find that each row has a common
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trace, and so does each column (for those non-technical folks, a trace is a
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connection etched out on a circuit board). Just follow these to the chip, and
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make your own schematic up. Now take a look for that extra pin-- there should
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be one floating around right next to the column pins. It will not be hooked up
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to anything else, that is, "hanging free". Drill a hole in the side of
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tonepad's case, and mount your switch. Radio Shack sells a nice microminiature
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switch that works excellently! (almost the only good thing I can say about
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Radio Shack in this article)
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Happy Phreaking.....
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Phincerely yours, Number Six.
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