Appendix 3: Schematics

Figure 1

The following diagram illustrates the generic transmission:

source: http://www.beyondlogic.org/keyboard/keybrd.htm

Figure 2

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

source: http://www.beyondlogic.org/keyboard/keybrd.htm

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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