64 lines
2.0 KiB
Plaintext
64 lines
2.0 KiB
Plaintext
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AST RESEARCH TECHNICAL BULLETIN TB-0032A 4-15-85
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5251 VERSION 2.1 INTERRUPT REQUEST SELECTION
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AST 5251 is configured to use IRQ 2. If another system device is
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utilizing this interrupt, a different interrupt request line may
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be selected.
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Here is a list of valid choices and their standard uses.
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IRQ 2 = Reserved
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IRQ 3 = Asynchronous Communications (secondary)
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SDLC Communications
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BSC (secondary)
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IRQ 4 = Asynchronous Communications (primary)
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BSC (primary)
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IRQ 5 = Fixed Disk (if you have the PC-XT)
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IRQ 6 = Diskette
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IRQ 7 = Printer
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To select a different interrupt, the CC432 card and the software
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must be reconfigured.
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Locate the switch bank on the CC432 board. Switches 3 through 8
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select the interrupt.
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SW 3 = IRQ 7
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SW 4 = IRQ 6
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SW 5 = IRQ 5
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SW 6 = IRQ 4
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SW 7 = IRQ 3
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An ON condition selects the interrupt, and only one IRQ position
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may be ON at any time.
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To patch AST5251.EXE, it is first necessary to rename it in order
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for DEBUG.COM to edit it. Type in the commands in boldface on a
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disk that has DOS, DEBUG and AST5251.EXE on it.
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A>REN AST5251.EXE AST5251.tst <ENTER>
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A>
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A>DEBUG AST5251.tst <ENTER>
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- e300 <ENTER>
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- 08ff:0300 0A.XX space bar 04.ZZ <ENTER>
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-W
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WRITING A000 BYTES
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-Q
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A>
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A>REN AST5251.tst AST5251.EXE
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A>
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Where XX and ZZ are equal to the value of the interrupt you have
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selected. Use the following table for correct value:
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XX ZZ
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0A. 04 = IRQ 2
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0B. 08 = IRQ 3
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0C. 10 = IRQ 4
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0D. 20 = IRQ 5
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0E. 40 = IRQ 6
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0F. 80 = IRQ 7
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