DIGITAL-LOGIC AG
MSM800 SEV Manual V1.0A
38
4.12
Memory
4.12.1
System Memory Map
The X86 CPU used as 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 - 0CBFFFh
0CC000 - 0CFFFFh
48 KBytes
16 KBytes
VGA BIOS
Free for user
0D0000 - 0DFFFFh
64 KBytes
free for user
0E0000 - 0EBFFFh
0EC000 – 0EFFFFh
48 KBytes
16 KBytes
Bios
BIOS extensions
0F0000 - 0FFFFFh
64 KBytes
Core BIOS
100000 - 1FFFFFFh
31 MBytes
DRAM for extended onboard memory
4.12.2
System I/O map
The following table shows the detailed listing of the I/O port assignments used in the MICROSPACE board:
Will follow in a later version of this manual
Содержание MICROSPACE MSM800SEV
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