Compaq MSB900 Memory & I/O Map, EEPROM Memory for Setup, System Memory Map, Digital-Logic Ag

DIGITAL-LOGIC AG MSB900/L Detailed Technical Manual V1.0

5.8.1.EEPROM Memory for Setup

The EEPROM is used for setup and configuration data, stored as an alternative to the CMOS-RTC. Option- ally, the EEPROM setup driver may update the CMOS RTC, if the battery is running down and the checksum error would appear and stop the system. The capacity of the EEPROM is 2 kByte.

Organization of the 2048Byte EEPROMs:

Address MAP:	Function:
0000h	CMOS-Setup valid (01=valid)
0001h	Reserved
0003h	Flag for DLAG-Message (FF=no message)
0010h-007Fh	Copy of CMOS-Setup data
0080h-00FFh	Reserved for AUX-CMOS-Setup
0100h-010Fh	Serial-Number
0110h-0113h	Production date (year/day/month)
0114h-0117h	1. Service date (year/day/month)
0118h-011Bh	2. Service date (year/day/month)
011Ch-011Fh	3. Service date (year/day/month)
0120h-0122h	Boot errors (Auto incremented if any boot error occurs)
0123h-0125h	Setup Entries (Auto incremented on every Setup entry)
0126h-0128h	Low Battery (Auto incremented every time the battery is low, EEPROM -> CMOS)
0129h-012Bh	Startup (Auto incremented on every power-on start)
0130h	Reserved
0131h	Reserved
0132h/0133h	BIOS Version (V1.4 => [0132h]:= 4, [0133h]:=1)
0134h/0135h	BOARD Version (V1.5 => [0124h]:=5, [0125h]:=1)
0136h	BOARD TYPE (‘M’=PC/104, ‘E’=Euro, ‘W’=MSWS, ‘S’=Slot, ‘C’=Custom, ‘X’= smart-
	Core or smartModule)
0137h	CPU TYPE:
	(01h=ELAN300/310, 02h=ELAN400, 05h=P5, 08h=P3, 09h=ELAN520, 10h=P-M).
0200h-03FFh	Reserved
0200h-027Fh	Reserved
0400h-07FFh	Free for Customer use

5.9.Memory & I/O Map

5.9.1.System Memory Map

The X86 CPU, used as a central processing unit on the MICROSPACE, has a memory address space which is defined by 32 address bits. Therefore, it can address 1 GByte of memory. The memory address MAP is as follows:

CPU GEODE

Address:	Size:	Function / Comments:
000000 - 09FFFFh	640 kBytes	Onboard DRAM for DOS applications
0A0000 - 0BFFFFh	128 kBytes	CGA, EGA, LCD Video RAM 128kB
0C0000 - 0C7FFFh	32 kBytes	VGA BIOS
0C8000 - 0CFFFFh	32 kBytes	Free for user
0D0000 - 0DFFFFh	64 kBytes	Free for user
0E0000 - 0EBFFFh	32 kBytes	Bios
0EC000 - 0EFFFFh	16 kBytes	BIOS extensions
0F0000 - 0FFFFFh	64 kBytes	Core BIOS
100000 - 1FFFFFFh	31 MBytes	DRAM for extended onboard memory

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