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A-3 TIME & DMA CHANNELS MAP
TIME MAP:
TIMER Channel 0 System timer interrupt.
TIMER Channel 1 DRAM REFRESH request.
TIMER Channel 2 SPEAKER tone generator.
DMA CHANNELS:
DMA Channel 0 Available.
DMA Channel 1 Onboard ECP (Option).
DMA Channel 2 FLOPPY DISK (SMC CHIP).
DMA Channel 3 Onboard ECP (default).
DMA Channel 4 Cascade for DMA controller 1.
DMA Channel 5 Available.
DMA Channel 6 Available.
DMA Channel 7 Available
A-4 INTERRUPT MAP
NMI :
Parity check error.
IRQ (H/W):
0 System TIMER interrupt from TIMER 0.
1 KEYBOARD output buffer full.
2 Cascade for IRQ 8-15.
3 SERIAL port 2.
4 SERIAL port 1.
5 PARALLEL port 2.
6 FLOPPY DISK (SMC CHIP).
7 PARALLEL port 1.
8 RTC clock.
9 Available.
10 Available.
11 Available.
12 PS/2 Mouse.
13 MATH coprocessor.
14 Onboard HARD DISK (IDE1) channel.
15 Onboard HARD DISK (IDE1) channel.
Appendix A2