Memory; System Memory Map - DIGITAL-LOGIC MICROSPACE PC/104 Technical User's Manual

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4.8

Memory

4.8.1

System Memory Map

The 386/486SX CPU, used as central processing unit on the MICROSPACE PC, has a memory ad-
dress space which is defined by 24 address bits. Therefore, it can address 16 MByte of memory. The
memory address MAP is as follows:
CPU 386SX or 486SLC
Address:
000000 - 09FFFFh
0A0000 - 0BFFFFh
0C0000 - 0CFFFFh
0D0000 - 0D3FFFh
0D4000 - 0D7FFFh
0D8000 - 0DFFFFh
0E0000 - 0EFFFFh
0F0000 - 0FFFFFh
100000 - 1FFFFFh
200000 - 7FFFFFh
The possible system memory sizes (DRAM) are:
2 MB MSMRAM2
4 MB MSMRAM4
8 MB MSMRAM8
Size: Function / Comments:
640 KBytes Onboard DRAM for DOS applications
128 KBytes CGA, EGA, LCD Video RAM 128kB
64 KBytes Reserved for expansion bus ROM's
C000 - C7FF for VGA BIOS
C800 - C8FF for EPP Bios
C900 - C9FF for REMOTE Bios
CA00 - CBFF for FFS and Setup BIOS
CC00 - CFFF for FFS shadow RAM
16 Kbytes reserved for PC CARD driver
16 Kbytes free for user
32Kbytes free for user
64 KBytes SSD, Flash-File-System memory window
64 KBytes Socket for BIOS and shadow DRAM
1 MByte DRAM for extended onboard memory
6 MBytes DRAM for extended onboard memory
2 MB Memory module for MSM486V
4 MB Memory module for MSM486V
8 MB Memory module for MSM486V
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MSM486V Manual V3.22