Compaq AP550 Compaq Professional Workstation AP550 Maintenance & Service G - Page 163

Physical and Operating Specifications 7-7 Table 7-5 System Memory Map Memory Address Size FFFFFFFFh to FFF80000h 512 KB FEEFFFFFh to FEE00000h 1024 KB FECFFFFFh to FEC00000h 1024 KB FEBFFFFFh to TOM (Top of Memory) Depends on memory installed TOM (Top of Memory) - 1 to TOM - 64 KB 64 KB (However, USB buffer not applicable to all system configurations.) TOM (Top of Memory) - 64 KB - 1 to 01000000h Depends on memory installed 00FFFFFFh to 00100000h 15,360 KB 000FFFFFh to 000F0000h 64 KB 000EFFFFh to 000E0000h 64 KB 000DFFFFh to 000C0000h 128 KB 000BFFFFh to 000A0000h 128 KB 0009FFFFh to 00000000h 640 KB 1 KB = 1024 bytes. Any memory above host memory is non-cacheable. System Function System ROM Local APIC address range I/O APIC address range PCI memory expansion board USB memory buffers HOST memory expansion HOST memory expansion System ROM Expansion system ROM Option ROM Video RAM Base memory