Draw and explain interfacing of DAC 0808 with 8086 using 8255. Write a program to generate square wave.

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DAC 0808 is an 8 bit Digital to Analog Converter. It can convert an 8 bit digital data input into an analog voltage output.
Reference voltage for conversion is provided using +Vref and –Vref. The output can be amplified (optional) using an op-amp.
DACs are used in various applications such as Waveform generation, PWM, Motor control Applications, DSP etc. Here we connect the output to a display device like a CRO.
By simple programming we can generate several types of wave forms like Ramp, Saw-tooth, Triangular waveform etc.

Interfacing of DAC 0808 using 8255

The output from 0808 DAC is current, so we need current to voltage converter at output of DAC as shown in figure below:

I to V Converter at Output of DAC

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