02529.pdf

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MMPC Model 10/20
(250-1640/41)
Memory Management
Faxback Doc. # 2529
Your System can accommodate the following types of memory:
Base RAM (conventional memory) - Memory below 640KB, which can be used by
MS-DOS and all MS-DOS applications without requiring drivers.
Shadow RAM (upper memory area) - Memory from 640KB to 1024KB to (1(MB),
which is used by the system BIOS, video BIOS, and other BIOS extensions.
Extended memory - Continuous memory above 1MB, which can be addressed
directly by i486 microprocessors. Extended memory is often used for
software disk caches, Ram disks, and software print spoolers. Extended
memory can be directly used by many Windows and MS-DOS applications when
you use the appropriate memory-related operating system features. Refer
to your operating system documentation to learn more about using extended
memory.
Extended memory - If you run programs that are designed to use expanded
memory, you can use MS-DOS commands to enable your system to use expanded
memory. Refer to your software documentation for more information on
using expanded memory.
The following diagram illustrates the arrangement of memory in your
computer:
67,108KB
┌──────────────────────┐
or 52,428KB
│
│
│
1000000-3FFFFFF
│Main
Logic Board
│
or 1000000-31FFFFF
│System
RAM
16,384KB
├──────────────────────┤
│
100000-FFFFFF
│Main
Logic Board System
│
│DRAM
or ISA Bus
1,024KB
├──────────────────────┤
│
0F8000-0FFFFF
│Shadow
DRAM Containing
│
│AT
System BIOS
992KB
├──────────────────────┤
│
0F0000-0F7FFF
│Shadow
DRAM Containing
│
│System
Setup Utility
960KB
├──────────────────────┤
│
0E0000-0EFFFF
│Unused
│
│Not
Available on ISA Bus
896KB
├──────────────────────┤
│
0D0000-0CFFFF
│
│
│
832KB
├──────────────────────┤Shadow
DRAM
│
0C0000-0CFFFF
│or
ISA Bus
│
│
768KB
├──────────────────────┤
│
0A0000-0BFFFF
│Video
DRAM
│
│
640KB
├──────────────────────┤
│
00000-09FFFF
│System
│
│DRAM
│
│
0KB
┴──────────────────────┘
(smc-02/02/94)

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