6–6 Maintenance and Service Guide
Specifications
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
Size Memory address System function
640 KB 00000000-0009FFFF Base memory
128 KB 000A0000-000BFFFF Video memory
48 KB 000C0000-000CBFFF Video BIOS
160 KB 000C8000-000E7FFF Unused
64 KB 000E8000-000FFFFF System BIOS
15 MB 00100000-00FFFFFF Extended memory
58 MB 04800000-07FFFFFF Super extended memory
58 MB 04800000-07FFFFFF Unused
2 MB 08000000-080FFFFF Video memory (direct access)
4 MB 08200000-FFFEFFFF Unused
64 MB FFFF0000-FFFFFFFF System BIOS
✎This table contains default values. The actual resource allocation is determined by the operating system.