Dell 200, 4100, 180 service manual DMA Channel Assignments, Dreq Line Assignments

	Table 1-3. Interrupt Assignments (continued)
IRQ Line	Used/Available
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

DMA Channel Assignments

	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

System Overview 1-23