most(all?) modern PC chipsets support so called system
control port (0x92) which provides A20 line handling
along with other features.
AFAIK bit 1 of 0x92 port control A20 line:
0 - A20 disable / forced 0 (real mode)
1 - A20 address line enable
But I didn't try it, you warned :)).
Best wishes,
Andrey
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