8155 is a multifunction device. It contains RAM, i/o port and timer.

8155 features:

1. Two programmable 8 bit i/o ports
2. One programmable 6 bit i/o ports
3. One programmable 14 bit binary counter and timer.
4. 2kbits static RAM 256x8.
5. Address bus AD0- AD7
6. It contains an internal select logic for memory and i/o using a command register and two i/o ports.
7. It can be easily interfaced with 8085 microprocessor.

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