Appendix ep-3vca2, A-3 timer & dma channels map, A-4 interrupt map – EPoX Computer EP-3VCA2 User Manual

Page 54

Advertising
background image

Appendix

EP-3VCA2

A-2

[2F8-2FF]

SERIAL port 2.

[360-36F]

NETWORK ports.

[378-37F]

PARALLEL port 1.

[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.

Advertising