Specifications
Maintenance and Service Guide
6–7
System DMA specifications
System memory map specifications
Hardware
DMA system function
DMA0
Not applicable
DMA1*
Not applicable
DMA2*
Not applicable
DMA3
Not applicable
DMA4
Direct memory access controller
DMA5*
Not applicable
DMA6
Not assigned
DMA7
Not assigned
*ExpressCard controller can use DMA 1, 2, or 5.
Size Memory
address
System
function
640 KB
00000000–0009FFFF
Base memory
128 KB
000A0000–000BFFFF
Video memory
64 KB
000C0000–000CFFFF
Video BIOS
64 KB
000E8000–000FFFFF
System BIOS
00100000–XFFFFFFF
Extended memory (based on
memory installed)
(X+1)0000000–FEDFFFFF
PCI bus
FED00000–FED003FF
High-precision event timer
FEE01000–FFFFFFFF PCI
bus
