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System Overview 1-23
DMA Channel Assignments
IRQ6 Generated by super I/O controller to indicate that diskette drive
requires service
IRQ7 Generated by super I/O controller to indicate that device con-
nected to parallel port requires service
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 Available for use by expansion card
IRQ15 Available for use by expansion card
Table 1-4. DREQ Line Assignments
DREQ Line Used/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
DREQ6 Available
DREQ7 Available
Table 1-3. Interrupt Assignments
(continued)
IRQ Line Used/Available