EPOX EP-3VBA, User Manual, Page: 52 / 63

Appendix
EP-3VBA
A-2
[3B0-3BF] MONOCHROME & PARALLEL port adapter.
[3C0-3CF] EGA adapter.
[3D0-3DF] CGA adapter.
[3F0-3F7] FLOPPY DISK controller.
[3F8-3FF] SERIAL port 1.
A-3 TIMER & DMA CHANNELS MAP
TIMER 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.