NCR 7454 - Memory Map (Pentium)

Chapter 3: Setup 3-9
Memory Map (Pentium)
ThefollowingtabledetailsthememorymapforthePentiumprocessor.
TheESCDareafromED000‐EDFFFisnotavailableforuseasanUpper
MemoryBlock(UMB)bymemorymanagers.TheareafromE0000‐
EBFFFiscurrentlynotusedbytheBIOSandisavailableforuseas
UMBby
memorymanagers.Partsofthisareamaybeusedbyfuture
versionsoftheBIOStoaddincreasedfunctionality.
Address Range (hex) Size Description
FECFF000‐FECFF01B 27 LANPXEROM
100000‐10000000 255MB Extendedmemory
F0000‐FFFFF 64K SystemBIOS
EE000‐EFFFF 8K MainBIOS(availableasUMB)
ED000‐EDFFF 4K ESCD(plugandplayconfiguration
area)
EC000‐ECFFF 4K OEM(availableasUMB)
E0000‐EBFFF 48K BIOSReserved(currentlyavailable
asUMB)
D0000‐DFFFF 64K AvailableHIDOSmemory
CE000‐CFFFF 8K FlashDisk(optional)
CC000‐CDFFF 8K NCRTrigantorMSR(optional)
C0000‐CBFFF 48K OnboardvideoBIOS
A0000‐BFFFF 128K Reservedforvideomemory
9FC00‐9FFFF 1K ExtendedBIOSData(moveableby
QEMM,386MAX)
80000‐9FBFF 127K Extendedconventional
00000‐7FFFF 512K Conventional
