29 lines
1.2 KiB
Plaintext
29 lines
1.2 KiB
Plaintext
AST RESEARCH TECHNICAL BULLETIN TB-0250 12/23/86
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INTERRUPT REQUEST (IRQ) LEVEL PRIORITY
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FOR THE AST-5251/11 EMULATION PACKAGE
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The factory default of Interrupt Request (IRQ) number two
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(2) for the AST-5251/11 emulator board should normally be
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utilized. If the user wishes to install other data
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communications adapter boards, for example, local area
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networking (LAN) boards in the same machine, AST recommends
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that the AST-5251/11 emulator board be allocated the highest
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priority IRQ. This is normally IRQ #2 for IBM PC's, XT's,
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and/or compatibles. In the case of the IBM PC/AT and/or
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compatibles, it is recommended that this be something other
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than IRQ #2, i.e., 3, 4, or 5.
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In order to avoid any hardware conflicts between the
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different boards, it is recommended that the LAN board's IRQ
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be set at an IRQ priority level that is lower than the AST-
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5251/11 emulator board. An example would be to install the
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PCnet II, an AST local area networking product, and the AST-
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5251/11 emulator board in the same machine. The 5251/11
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emulator board should be set at the factory default (IRQ #2)
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and the PCnet II LAN board set at a lower priority IRQ of
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either 3, 4, or 5.
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