electronic poker dice

Most people will have played with poker dice at one time or another, but not everyone will have realised that there are considerable possibil i-ties for the ski I led player to cheat. The following circuit for an electronic set of dice should contri-bute to ensuring a more honest game. The five dice are replaced by five rows of six LEDs (D1 ... D30, see figure 2) each LED corresponding to a different face of the die. For each row there is a `throw` button (S2, S4, S6, S8, S10) and a `set aside` button. When a `throw` button is pressed, the result is not displayed immediately. To find out which faces of the dice have been thrown, it is necessary to press the `shaker` button S11, which, as it were, `uncovers` the dice, enabling the players to see them. If one has thrown, say, a pair on the first turn, by pressing the corresponding `set aside` buttons, the two LEDs re-presenting the pair will remain permanently lit. This is the equiva-lent of setting the pair of dice to one side (for all to see), before putting the remaining three dice back into the shaker and trying to im-prove one`s score. The actual circ