John Bell Engineering CRT Controller board

Circa 1981

Board

Key Components

• Intel 8275 - Programmable CRT Controller
• Intel 8251 - Universal synchronous and asynchronous receiver-transmitter (UART)
• Intel 8253 - Programmable Interval Timers
• Intel 8255 - Programmable Peripheral Interface
• Intel 8085 - 8 bit microprocessor

Schematic

See pages 3 and 4 of the manual.

Front

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