Memory; System Memory Map; System I/O Map - DIGITAL-LOGIC MICROSPACE MSM800SEV Technical User's Manual

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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:
000000 - 09FFFFh
0A0000 - 0BFFFFh
0C0000 - 0CBFFFh
0CC000 - 0CFFFFh
0D0000 - 0DFFFFh
0E0000 - 0EBFFFh
0EC000 – 0EFFFFh
0F0000 - 0FFFFFh
100000 - 1FFFFFFh
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
Size: Function / Comments:
640 KBytes Onboard DRAM for DOS applications
128 KBytes CGA, EGA, LCD Video RAM 128kB
48 KBytes VGA BIOS
16 KBytes Free for user
64 KBytes free for user
48 KBytes Bios
16 KBytes BIOS extensions
64 KBytes Core BIOS
31 MBytes DRAM for extended onboard memory
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MSM800 SEV Manual V1.0A