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B.1
System I/O Ports
Table B.1: System I/O ports
Addr. range (Hex)
000-01F
020-021
040-05F
060-06F
070-071
87-8A
0A0-0A1
0C0-0DF
1F0-1F8
278-27F
2E8-2EF
2F8-2FF
378-37F
3B0-3BF
3D0-3DF
3E8-3EF
3F0-3F7
3F8-3FF
* PNP audio I/O map range from 220 ~ 250H (16 bytes) MPU-401 select from 300 ~
330H (2 bytes)
B.2
1st MB Memory Map
Table B.2: 1st MB memory map
Addr. range (Hex)
F0000h - FFFFFh
*CC000h - EFFFFh
C0000h - CBFFFh
B8000h - BFFFFh
B0000h - B7FFFh
A0000h - AFFFFh
00000h - 9FFFFh
* If Ethernet boot ROM is disabled (Ethernet ROM occupies about 16 KB)
* E0000 - EFFFF is reserved for BIOS POST
B.3
DMA channel assignments
Table B.3: DMA channel assignments
Channel
0
PCM-3362 User Manual
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Device
DMA controller
Interrupt controller 1, master
8254 timer
8042 (keyboard controller)
Real-time clock, non-maskable interrupt (NMI) mask
DMA page register
Interrupt controller 2
DMA controller
Fixed disk
Reserved (Parallel port 2,LTP3)
Reserved (Series port 4)
Serial port 2
Parallel printer port 1 (LPT 2)
Monochrome display and printer adapter (LPT1)
Color/graphics monitor adapter
Series port 3
Diskette controller
Serial port 1
Device
System ROM
Unused (reserved for Ethernet ROM)
Expansion ROM (for VGA BIOS)
CGA/EGA/VGA text
Unused
EGA/VGA graphics
Base memory
Function
Available
66
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