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參數(shù)資料
| 型號(hào)： | DM5806 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | DM5806 DATA MODULE DIGITAL I/O BOARD |
| 中文描述： | DM5806數(shù)據(jù)模塊數(shù)字I / O板 |
| 文件頁數(shù)： | 44/64頁 |
| 文件大?。?/td> | 270K |
| 代理商： | DM5806 |
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4-14
– Restoring the Startup IMR and Interrupt Vector
Before exiting your program, you must restore the interrupt mask register and interrupt vectors to the state they
were in when your program started. To restore the IMR, write the value that was saved when your program started
to I/O port 21H. Restore the interrupt vector that was saved at startup with either DOS function 35H (get interrupt
vector), or use the library routine supplied with your compiler. Performing these two steps will guarantee that the
interrupt status of your computer is the same after running your program as it was before your program started
running.
- Common Interrupt Mistakes
Remember that hardware interrupts are numbered 8 through 15, even though the corresponding IRQs are
numbered 0 through 7.
Two of the most common mistakes when writing an ISR are forgetting to clear the interrupt status of the
DM5806 and forgetting to issue the EOI command to the 8259 interrupt controller before exiting the ISR.
Example Programs
Included with the DM5806 is a set of example programs that demonstrate the use of many of the board’s
features. These examples are in written in C, Pascal, Assembly, and BASIC. Also included is an easy-to-use menu-
driven diagnostics program, 5806DIAG, which is especially helpful when you are first checking out your board
after installation.
Before using the software included with your board, make a backup copy of the disk. You may make as many
backups as you need.
C and Pascal Programs
These programs are source code files so that you can easily develop your own custom software for your
DM5806 board.
Digital I/O:
DIGITAL
Simple program the shows how to read and write the digital I/O lines.
Timer/Counters:
TIMER
A short program demonstrating how to program the 8254 for use as a timer.
BASIC Programs
These programs include both source code files and executable files so that you can run them on your DM5806.
All of the executable programs are set up to look for the board at a base address (BA) of 300 hex (768 decimal). If
you change the base address of the board, you must also change the BA in your programs.
Digital I/O:
DIGITAL
Simple program the shows how to read and write the digital I/O lines.
Timer/Counters:
TIMER
A short program demonstrating how to program the 8254 for use as a timer.
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