Ampro Corporation XTX 820 Address Map, Address Range Size Description Decimal Hex, 0CFC 0CFF

Chapter 3 Hardware

Address Range		Address Range	Size	Description
(decimal)		(hex)
639 k - 640 k		9FC00 - 9FFFF	1 kB	Extended BIOS data
0 - 639k		00000 - 9FC00	512 kB	Conventional memory
Notes:	T.O.M. = Top of memory = max. DRAM installed

*VGA frame buffer can be reduced to 1MB in setup.

**Only if ACPI Aware OS is set to YES in setup.

I/O Address Map

Table 3-3 list the I/O address map.

Table 3-3. I/O Address Map

I/O Address (hex)		Size	Available	Description
0000	– 00FF	256 bytes	No	Baseboard resources
0100	– 0110	16 bytes	No	System Control
0170	– 0177	8 bytes	No	Secondary IDE channel
01F0 – 01F7		8 bytes	No	Primary IDE channels
0278	– 027F	8 bytes	Note 2	Parallel Port 2 (LPT2)
02E8 – 02EF		8 bytes	Note 2	Serial Port 4 (COM4)
02F8 – 02FF		8 bytes	Note 1	Serial Port 2 (COM2)
0376		1 byte	No	Secondary IDE channel command port
0377		1 byte	No	Secondary IDE channel status port
0378	– 037F	8 bytes	Note 1	Parallel Port 1 (LPT1)
03B0 – 03DF		16 bytes	No	Video system
03E8 – 03EF		8 bytes	Note 2	Serial Port 3 (COM3)
03F0 – 03F5		6 bytes	No	Floppy channel 1
03F6		1 byte	No	Primary IDE channel command port
03F7		1 byte	No	Primary IDE channel status port
03F8 – 03FF		8 bytes	Note 1	Serial Port 1 (COM1)
0480	– 04BF	64 bytes	No	Baseboard resources
04D0 – 04D1		2 bytes	No	Baseboard resources
0800	– 087F	128 bytes	No	Baseboard resources
0A00 – 0A0F		16 bytes	No	Baseboard resources
0CF8 – 0CFB		4 bytes	No	PCI configuration address register
0CFC – 0CFF		4 bytes	No	PCI configuration data register
0D00 – FFFF			Note 3	PCI / PCI Express bus

Notes: 1. Default, but can be changed to another address range.

2.When baseboard external Super I/O controller is present.

3.The BIOS assigns PCI and PCI Express I/O resources from FFF0h downwards. Non PnP/PCI/PCI Express compliant devices must not consume I/O resources in that area.

18 Reference Manual XTX 820