Dell OptiPlex GL Service Manual - Page 23
DMA Channel Assignments, Table 1-4., DREQ Line Assignments, Interrupt Assignments
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Table 1-3. Interrupt Assignments (continued) IRQ Line Used By/Available IRQ8 Generated by keyboard controller for each tick of RTC. IRQ9 Available for use by expansion card. IRQ10 Available for use by expansion card. IRQ11 Available for use by expansion card. IRQ12 Generated by keyboard controller to indicate that mouse's output buffer is full. IRQ13 Generated by math coprocessor to indicate coprocessor error. IRQ14 Generated by device connected to primary EIDE port to indicate that device requires service. If no EIDE devices are installed, this line is available for other use. IRQ15 Generated by device connected to secondary EIDE port to indicate that device requires service. If no device is connected to secondary EIDE port, IRQ15 is available for use by expansion card. DMA Channel Assignments Table 1-4. DREQ Line Assignments DREQ Line Used By/Available DREQ0 Available DREQ1 Available DREQ2 Generated by super I/O controller to initiate DMA cycle for attached diskette drive DREQ3 Available DREQ4 Generated by bus controller chip to activate second DMA controller DREQ5 Available (default) DMA on-board sound controller DREQ6 Available DREQ7 Available System Overview 1-15
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