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CX400 (Juneau) Motherboard Resources

Memory Map

Address Range (decimal) Address Range (hex) Size Description
1024 K - 393216 K 100000 - 18000000 383 MB Extended memory
928 K - 1024 K E8000 - FFFFF 96 KB System BIOS
896 K - 928 K E0000 - E7FFF 32 KB System BIOS (available as UMB)
800 K - 896 K C8000 - DFFFF 96 KB Available high DOS memory (open to ISA and PCI buses)
640 K - 800 K A0000 - C7FFF 160 KB Video memory and BIOS
0 K - 640 K 00000 - 9FFFF 640 KB Conventional memory

DMA Channels

DMA Channel Number Data Width System Resource
0 8- or 16-bits Audio
1 8- or 16-bits Audio/parallel port
2 8- or 16-bits Diskette drive
3 8- or 16-bits Parallel port (for ECP)/audio
4 Reserved - cascade channel
5 16-bits Open
6 16-bits Open
7 16-bits Open

I/O Map

Address (hex) Size Description
0000 - 000F 16 bytes DMA controller 1
0020 - 0021 2 bytes Interrupt controller 1
002E - 002F 2 bytes Super I/O controller configuration registers
0040 - 0043 4 bytes Counter/Timer 1
0048 - 004B 4 bytes Counter/Timer 2
0060 1 byte Keyboard controller
0061 1 byte NMI, speaker control
0064 1 byte Keyboard controller
0070 - 0071 2 bytes Real time clock controller
0080 - 008F 16 bytes DMA page registers
00A0 - 00A1 2 bytes Interrupt controller 2
00B2 - 00B3 2 bytes APM control
00C0 - 00DE 31 bytes DMA controller 2
00F0 - 00FF 16 bytes Numeric processor
0170 - 0177 8 bytes Secondary IDE controller
01F0 - 01F7 8 bytes Primary IDE controller
0200 - 0207 8 bytes Audio / game port / joy stick
0220 - 022F 16 bytes Audio (Sound Blaster compatible)
0228 - 022F 8 bytes LPT3
0278 - 027F 8 bytes LPT2
02E8 - 02EF 8 bytes COM4/Video (8514A)
02F8 - 02FF 8 bytes COM2
0330 - 0331 2 bytes MPU-401 (MIDI)
0376 - 0377 2 bytes Secondary IDE controller
0120 - 0127 8 bytes Audio controller
0274 - 0277 4 bytes I/O read data port for ISA Plug and Play enumerator
0378 - 037F 8 bytes LPT1
0388 - 038D 6 bytes AdLib (FM synthesizer)
03B0 - 03BB 12 bytes Video (monochrome)
03C0 - 03DF 32 bytes Video (VGA)
03E8 - 03EF 8 bytes COM3
03F0 - 03F5, 03F7 7 bytes Diskette controller
03F6 1 byte Primary IDE controller
03F8 - 03FF 8 bytes COM1
04D0 - 04D1 2 bytes Edge/level triggered PIC
0530 - 0537 8 bytes Windows Sound System
LPTn + 400h 8 bytes ECP port, LPTn base address + 400h
0CF8 - 0CFF * 8 bytes PCI configuration registers
0CF9 ** 1 byte Turbo and reset control register

*  DWORD access only
** Byte access only

PCI configuration space map (figures in hex)

Bus No. Device No. Function No. Description
00 00 00 Intel 82443BX (PAC)
00 01 00 Intel 82443BX (PAC) A.G.P. bus
00 07 00 Intel 82371EB (PIIX4E) PCI/ISA bridge
00 07 01 Intel 82371EB (PIIX4E) IDE bus master
00 07 02 Intel 82371EB (PIIX4E) USB
00 07 03 Intel 82371EB (PIIX4E) power management
00 0B 00 Audio/multimedia controller
00 0D 00 PCI expansion slot 1 (on the riser)
00 0E 00 PCI expansion slot 2 (on the riser)
00 0F 00 PCI expansion slot 3 (on the riser)
00 10 00 PCI expansion slot 4 (on the riser)

Interrupts

IRQ System Resource
NMI I/O channel check
0 Reserved, interval timer
1 Reserved, keyboard buffer full
2 Reserved, cascade interrupt from slave PIC
3 COM2*
4 COM1*
5 LPT2 (Plug and Play option)/audio/user available
6 Diskette drive controller
7 LPT1*
8 Real time clock
9 Reserved
10 USB/User available
11 Windows Sound System*/user available
12 Onboard mouse port (if present, else user available)
13 Reserved, math coprocessor
14 Primary IDE (if present, else user available)
15 Secondary IDE (if present, else user available)

* Default, but can be changed to another IRQ

 

 

Computing for a Connected World