phatcode.net / Using EMS in QuickBASIC: Part 1 by Plasma (Jon Ρetrosky)
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1/2002JNM1 Positional Notation (Hex Digits). 1/2002JNM2 Problem The 8086 has a 20-bit address bus. Therefore, it can access 1,048,576 bytes of memory. - ppt download
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The 640K memory limit of MS-DOS | XtoF's Lair
Microprocessors
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Why did IBM create a 640k limit in the original IBM PC, instead of allowing the full 1024k be usable, but Macs, Atari ST, Amiga's had no such limit? - Quora
Lo-tech Memory Board FAQ - Lo-tech Wiki
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