Extended Frontier
Everything above 1 megabyte — the vast wilderness of extended memory. Accessible only through HIMEM.SYS and the XMS protocol. The frontier is enormous but alien. Programs born in real mode cannot run ...
Everything above 1 megabyte — the vast wilderness of extended memory. Accessible only through HIMEM.SYS and the XMS protocol. The frontier is enormous but alien. Programs born in real mode cannot run ...
The ROM addresses at the top of the first megabyte — 0xF0000 through 0xFFFFF. Firmware. The original instructions burned into silicon at the factory, immutable since the day the motherboard was manufa...
The 384 kilobytes above conventional memory — addresses 0xA0000 through 0xFFFFF. EMM386.EXE found the gaps and made them habitable. Programs that earn the LOADHIGH privilege are relocated here, freein...
The first 640 kilobytes — addresses 0x00000 through 0x9FFFF. The old city. Every program starts here; most programs never leave. Conventional memory is crowded, contested, and precious. IRQ conflicts ...