Tandy/Radio Shack Computerized Arcade-12 Pinout
                 -----------------------------------------------

10302012 
K.Horton
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This doodad is a 12 buttoned and 12 light somewhat large tabletop game.  
Supposidly there's 12 games built in.  Each button is a different colour and
a light bulb hides behind each.  At startup, it lights each button up,
one at a time and makes a rising tone for each button as it does so.

You then select a game and the fun begins.

Inside it is a TMS1100 (marked CD7282SL).  

It runs on a 9V and four C cells.  The 9V runs the TMS1100 and the C cells 
run the speaker and the light bulbs via transistors.

The connections are as follows:

O0 through O7 connect to the lights under buttons 1 through 8 in order.  A high
on the output lights up the desired button.

R0 through R3 connect to the lights under buttons 9-12 in order. Again, a high
on the output lights up the desired button.

R10 connects to the speaker via a transistor.  The software in the TMS1100
toggles this line in real time to make tones and noises via toggling and
software delay loops.

There's 17 buttons on the game, connected in a matrix like so:


       +----+  +----+  +----+  +----+
R8 o---| 1  |--| 2  |--| 3  |--| 4  |
       +----+  +----+  +----+  +----+
          |       |       |       |
       +----+  +----+  +----+  +----+
R9 o---| 5  |--| 6  |--| 7  |--| 8  |
       +----+  +----+  +----+  +----+
          |       |       |       |
       +----+  +----+  +----+  +----+
R5 o---| 9  |--| 10 |--| 11 |--| 12 |
       +----+  +----+  +----+  +----+
          |       |       |       |
       +----+  +----+  +----+  +----+
R6 o---| ST |--| SL |--| HT |--| SP |
       +----+  +----+  +----+  +----+
          |       |       |       |
       +----+     |       |       |
R7 o---| RP |     |       |       |
       +----+     |       |       |
          |       |       |       |
          o       o       o       o
         K8      K4      K2      K1


ST = start, SL = select, HT = hit, SP = space, RP = repeat


There's an RC oscillator (47pf, 39K) running the TMS1100.  A capacitor is used
for a reset generator, and that's it.


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