Application Examples
Program Code
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PROGRAMMING ABSTRACT
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SHAWN SHURICK
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6/30/88
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ZIATECH CORP.
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SAN LUIS OBISPO, CA
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; THIS PROGRAMMING EXAMPLE IS FOR THE ZT 8809A CPU BOARD.
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IT IS INTENDED TO DEMONSTRATE THE USE OF THE 8259A
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INTERRUPT CONTROLLER TOGETHER WITH A COUNTER/TIMER.
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INITIALIZATION OF THE 8259A AND THE INTERRUPT VECTOR
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IS SHOWN, ALONG WITH INITIALIZATION OF THE COUNTER/
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TIMER 2. THE FRAMEWORK OF AN INTERRUPT SERVICE ROUTINE
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IS ALSO IMPORTANT AND DEMONSTRATES THE USE OF THE END
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OF INTERRUPT (EOI).
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JUMPER CHANGES
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; THE ZT 8809A IS SHIPPED WITH THE JUMPERS ASSIGNED CORRECTLY
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FOR THIS EXAMPLE EXCEPT THE FOLLOWING:
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MOVE W6A TO W6B - SELECTS TIMER 2 INSTEAD OF
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STD BUS INTRQ* TO DRIVE IR2
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