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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SYSTEM CONFIGURATION
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; THE SYSTEM IS ASSUMED TO CONTAIN ONE ZT 8808A OR ZT 8809A,
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WITH STD DOS SOFTWARE INSTALLED. IN ADDITION, A
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ZT 8840 IS INSTALLED AT I/O ADDRESS E0H CONFIGURED AS
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A SLAVE INTERRUPT CONTROLLER. BE SURE NO OTHER CARDS
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THAT USE THE BACKPLANE INTERRUPT REQUEST TO THE ZT 8809A
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(STD BUS SIGNAL INTRQ*) ARE INSTALLED IN THE SYSTEM,
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SUCH AS THE ZT 8890 NETWORK CARD.
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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. THE ZT 8840 REQUIRES THE REMOVAL OF
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JUMPERS W1-3, TO PLACE THE BOARD AT E0H.
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