PC Memory - Help F1

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Perth Metropolitan - Western Australia


HIGH DOS MEMORY - Print off and use to mark your memory addresses:

   **Top of Memory - Memory beginning is at bottom of table...

from
000
100
200
300
400
500
600
700
800
900
A00
B00
C00
D00
E00
F00
to...
0FF
1FF
2FF
3FF
4FF
5FF
6FF
7FF
8FF
9FF
AFF
BFF
CFF
DFF
EFF
FFF
Extended Memory etc
Extended Memory etc
Extended Memory etc
Extended Memory etc
1024k
Interpreted Basic - Cassette / System Bios
System Bios / Some Roms
F
                                
960k
[*] Shadow Rom - Not available
on some AT's / 386's & IBM PS2
E
                                
896k
[*] VGA Bios in 16bit mode / Cluster Adapter
[*] VGA Bios in 16bit mode
D
                                
832k
[*] EGA / VGA Memory
[*] HDisk Controller[XT] or VGA Bios
C
                                
768k
Monochrome / Text Video
CGA / EGA / VGA Text
B
                                
704k
EGA / VGA Hi / Res Graphics
EGA / VGA Hi / Res Graphics
A
                                
640k
Conventional DOS Memory
Conventional DOS Memory

   **Memory starts here and is read upwards

High DOS memory includes High Memory; System Memory;
Upper Memory Area (UMA) and Upper Memory Blocks (UMBs)
[*] available for drivers & EMS page frame
NB: By default all memory devices considered 8 bit devices. All 16 bit devices declare their
presence by raising a flag. Because of this, any 16 bit device within a 128k segment
[ie C000-DFFF - or any 2 contiguous 64k segments] causes the entire segment to be
treated as 16 bit memory, which may cause problems for 8 bit devices in that segment.
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!Help-F1 - Barry CONNELL
Perth, Western Australia
Tel: +618 9341 2658  Fax: +618 9245 4986

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