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It is the uppermost region of the PC memory map for ROM, usually from 640K up to 1024K, originally reserved for BIOS, device drivers, and TSRs.
in paper draw squares to make a memory map
The PC patches include the map packs for free (PC Only)
Connect memory card to your PC, copy and paste in the files from your PC to your card
Conventional memory refers to the memory reserved to run DOS programs in a computer system. DOS only uses the first 640 kb of memory in a PC.