Appendix 3:  Schematics


Figure 1


The following diagram illustrates the generic transmission:




Figure 2


The following diagram shows the output pins of the keyboard, and how we connected them to the keyboard MCU:





Figure 3


The following figure shows the circuit for video output generation:


Figure 4


The following is the state diagram for decoding the keyboard:

Figure 5


The following is the diagram of the master/slave configuration for the SPI:


Source:  Atmel Mega32 Specification


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