
Typical Power Consumption/Availability for ISA Accessory Slots
+5 V 1 A limit per slot (limited by system board)
+12 V 0.2 A limit per slot (limited by system board)
- 5 V 0.2 A total power limit (limited by power supply)
-12 V 0.5 A total power limit (limited by power supply)
Typical Power Consumption/Availability for PCI Accessory Slots
+3.3 V 2.5 A maximum per slot
+5 V 2.5 A maximum per slot
+12 V 0.2 A maximum per slot
-12 V 0.2 A maximum per slot
There is a maximum per-slot limit of 15 W between all supply rails.
THE PC’S MEMORY MAP
Memory Area Memory Range Hexadecimal
Address Range
Used By
Extended Memory: 1 MB to 256 MB
Extended
memory
1024 KB upward 01000 to 0F0000 Windows Applications
Conventional Memory: 0 KB to 1024 KB (1 MB)
384 KB
Reserved
Memory Area
960 KB to 1024 KB 0F0000 to 010000 64 KB BIOS area
896 KB to 960 KB 0E0000 to 0F0000 64 KB (available)
800 KB to 896 KB 0C8000 to 0E0000 96 KB available for accessory
boards
768 KB to 800 KB 0C0000 to 0C8000 32 KB Video BIOS Area
640 KB to 768 KB 0A0000 to 0C0000 128 KB Video Memory Area
640 KB Base
Memory Area
0 KB to 640 KB 09F000 to 0A0000 Extended BIOS Data Area
— User Application Area
— MS-DOS Operating System
0500 to 0700 MS-DOS Temp Buffer
0400 to 04FF BIOS Data Area
0000 to 03FF Interrupt Vector Table
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