EXTENDING THE BUS

The TDS2020F data bus carries 100ns digital signals and should not be led more than 300mm (12 inches) from the computer. This is only a guideline because degradation of signal edges caused by capacitance will depend on the particular ribbon cable used. However some applications need a display and keyboard remote from the TDS2020F, for example where they are on an operator's control panel and the computer is closer to the point of control.

Extending the bus
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The diagram shows how the data bus, Port B and other lines can be buffered. Use good shielding to contain the increased electromagnetic radiation. A character LCD is shown but you can use the same principles to make a circuit for graphics types.