DIGITAL-LOGIC AG
MSM800SEV/SEL/BEV/XEV/XEL Detailed Manual V1.7
54
5.7.2.
ROM-BIOS Sockets
An EPROM socket with 8bit wide data access normally contains the board’s AT compatible ROM-BIOS. The
socket takes a 29F020 EPROM (or equivalent) device. The board's wait-state control logic automatically
inserts four memory wait states in all CPU accesses to this socket. The ROM-BIOS sockets occupy the
memory area from C0000H through FFFFFh; however, the board's ASIC logic reserves the entire area from
C0000h through FFFFFh for onboard devices, so that this area is already usable for ROM-DOS and BIOS
expansion modules. Consult the appropriate address map for the MICROSPACE PC-Product ROM-BIOS
sockets.
5.7.2.1. Standard BIOS ROM
Device:
FWH
Map:
E0000 - FFFFFh
Core BIOS 128k
C0000 - C7FFFh
VGA BIOS 32k
CC000 - CFFFFh
FREE
5.7.3.
BIOS CMOS Setup
If wrong setups are memorized in the CMOS-RAM, the default values will be loaded after resetting the
RTC/CMOS-RAM by de-soldering the battery.
If the battery is down, it is always possible to start the system with the default values from the BIOS.
Note...
For the MSM800BEV/XEV/XEL: Should the product have an inaccurate BIOS setup and won’t boot
up, proceed as follows. (The installed BIOS must be V1.20 or newer.)
1. Set J7
2. Turn the power on
3. Press F1 to enter the BIOS setup
4. Select “L” to load the BIOS default settings
5. Remove J7
6. Select “X” to save and exit the BIOS setup
5.8. CMOS RAM Map
Systems based on the industry-standard specification include a battery backed Real Time Clock chip. This
clock contains at least 64Bytes of non-volatile RAM. The system BIOS uses this area to store information
including system configuration and initialization parameters, system diagnostics, and the time and date. This
information remains intact even when the system is powered down.
The BIOS supports 128Bytes of CMOS RAM. This information is accessible through I/O ports 70h and 71h.
CMOS RAM can be divided into several segments:
Locations 00h - 0Fh contain the real time clock (RTC) and status information
Locations 10h - 2Fh contain system configuration data
Locations 30h - 3Fh contain system BIOS-specific configuration data as well as chipset-specific
information
Locations 40h - 7Fh contain chipset-specific information as well as power management configuration
parameters
Summary of Contents for MSM800BEV
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