User manual

MIO-2260 User Manual 74
C.1 System I/O Ports
C.2 1st MB Memory Map
C.3 DMA Channel Assignments
Table C.1: System I/O Ports
Addr. Range (Hex) Device
000-01F DMA Controller
20h-2Dh Interrupt Controller
50h-52h Timer/Counter
060-06F 8042 (keyboard controller)
070-07F Real-time clock, non-maskable interrupt (NMI)
mask
080-09F DMA page register
0A0-0BF 0A0-0BF
0C0-0DF DMA controller
170h-177h IDE Controller
1F0h-1F7h IDE Controller
2F8-2FF Serial port 2
3F8-3FF Serial port 1
Table C.2: 1
st
MB memory map
Addr. Range (Hex) Device
F0000h - FFFFFh System ROM
D0000h - EFFFFh Unused (reserved for Ethernet ROM)
C0000h - CE7FFh Expansion ROM (for VGA BIOS)
B8000h - BFFFFh CGA/EGA/VGA text
B0000h - B7FFFh Unused
A0000h - AFFFFh EGA/VGA graphics
00000h - 9FFFFh Base memory
Table C.3: DMA channel assignments
Channel Function
0 Available
1 Reserved (audio)
2 Floppy disk (8-bit transfer)
3 Available (parallel port)
4 Cascade for DMA controller 1
5 Available
6 Available
7 Available
* Audio DMA select 1, 3, or 5
** Parallel port DMA select 1 (LPT2) or 3 (LPT1)