Reverse engineering an MB Electronic Simon game

Posted on Feb 5, 2014

The MB Electronics Pocket Simon game has a very simple circuit thanks to the inclusion of a custom MB Electronics processor (the MB4850) which performs nearly all of the functions for the game. The only other significant piece of electronics is a SN75494N chip which interfaces the processor to the light bulbs and the built in piezo buzzer. The a

Reverse engineering an MB Electronic Simon game
Click here to download the full size of the above Circuit.

im of this exercise is to reverse engineer the Pocket Simon game so that it can be replicated as accurately as possible using modern components (or even reproduced entirely in software). This includes analysing the hardware (how it is built and how it works), the software (including timing, note frequencies, game modes, light sequences, etc. ). Since the processor of the Pocket Simon is the same as found in the full size Simon all information contained in this document are relevant to both (I chose the Pocket Simon since I didn`t want to risk damaging my full size game). Single Player The game generates a sequence of lights and sounds which the player must follow, the sequence grows by one colour every turn and ends when the player makes a mistake or repeats the maximum number of colours in a sequence (which is dependent on the skill level setting) Multi Player (game 2) The game begins with Simon displaying a colour, the first player must repeat the colour and then select another colour, subsequent players must enter the current sequence and then add one more, the next player then selects the sequence of colours entered so far and then one more and so on until a player makes a mistake (or a sequence of 31 colours is achieved). Multi Player (game 3) This game is identical to game one, however each player owns one or more colours and is responsible for pressing it during the sequence. If a colour is incorrectly selected...

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