Bios; Rom-Bios Sockets; Standard Bios Rom; Eeprom Memory For Setup - DIGITAL-LOGIC MICROSPACE PC/104 Technical User's Manual

DIGITAL-LOGIC AG
4.6

BIOS

4.6.1

ROM-BIOS Sockets

An EPROM socket with 8 Bit wide data access normally contains the board's AT compatible ROM-
BIOS. The socket takes any of a 27C010 to 27C040 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 occupies 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 this
area is already usable for ROM-DOS and BIOS expansion modules. Consult the appropriate address
map for the MICROSPACE MSM486V ROM-BIOS sockets.

4.6.1.1 Standard BIOS ROM

DEVICE:
MAP:
4.6.2

EEPROM Memory for Setup

The EEPROM is used for setup and configuration data, stored as an alternative to the CMOS-RTC.
Optionally, the EEPROM setup driver may update the CMOS RTC, if the battery is running down, the
checksum error would appear and stop the system. The capacity of the EEPROM is 128 Byte.
4.6.3

BIOS CMOS Setup

If wrong setups are memorized in the CMOS-RAM, the default values will be loaded after resetting the
RTC/CMOS-RAM with the CMOS-RESET jumper. If the battery is down, it is always possible to start
the system with the default values from the BIOS.
The following entries may be made:
Date: The current Real Date of the RTC
Time: The current Real Time of the RTC
Drive: A or B none
360k
1,2 MB
720 K
1,44 MB
The A: Drive is the bootable drive.
Display type: CRT:
40 x 25:
80 x 25:
VGA:
Harddisk type: defines which drive is connected
Type = 0 means no drive is present (Default)!
Drive Type 48 and 49 let you define a custom harddisk parameter.
Press F1 for autodetect the connected IDE drive.
27C010 PLCC32
F0000 - FFFFFh
C0000 - C7FFFh
C8000 - CFFFFh
= no drive present, SSD / ROM-Disk enabled (if device is loaded)
= 5,25" low density drive, SSD disabled
= 5,25" high density drive
= 3,5" low density drive
= 3,5" high density drive (Default for A:)
for Mono CRT's but no LCD operating possible.
for Color CGA or LCD
for Color CGA or LCD (Default)
for VGA
ChipSet BIOS from Chips & Technology
VGA BIOS
FFS-BIOS and Setup-BIOS
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MSM486V Manual V3.22