GL815E Endura Motherboard Product Manual
Page 41 of 51
A.5. ISA Interrupt Allocation
The ISA interrupts are allocated as described in the table below.
Interrupt Description
IRQ0 System Timer
IRQ" Keyboard Controller
IRQ2 Cascade interrupt
IRQ3 COM2, COM" or unassigned
IRQ4 COM", COM2 or unassigned
IRQ5 Parallel port or unassigned
IRQ6 Floppy
IRQ7 Printer port or unassigned
IRQ8 Real time clock/CMOS RAM
IRQ9 Unassigned
IRQ"0 Unassigned
IRQ"" Unassigned
IRQ"2 PS/2 mouse or unassigned
IRQ"3 Floating point unit
IRQ"4 Primary IDE or unassigned
IRQ"5 Secondary IDE or unassigned
NMI PCI PERR and SERR signals and ISA IOCHCHK
A.6. ISA DMA Channel Allocation
Whilst the motherboard does not support an ISA bus, it includes an ISA-compatible DMA controller
in order to be compatible with AT standard architecture. The DMA channels are allocated as
described in the table below.
DMA Channel Description
Channel 0 Unassigned 8-bit channel
Channel " Unassigned 8-bit channel
Channel 2 Floppy controller or unassigned 8-bit channel
Channel 3 ECP parallel port or unassigned 8-bit channel
Channel 4 Cascade channel
Channel 5 Unassigned "6-bit channel
Channel 6 Unassigned "6-bit channel
Channel 7 Unassigned "6-bit channel
