There is one more thing..... On 286's and above when in real mode, if the segment register is set to 0xffff then the address's above 0xffff will overflow into address bit a20 giving access to an additional 65k(-16 bytes) of memory in real mode. This was known as 'hi-mem' access and dos 4.0 and above used this trick. (meant turning that a20 gate on to allow a20 through). === Amateur Radio, when all else fails!
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