A20 handler




<software, storage> IBM PC memory manager software providing HMA.

XMMs usually provide this functionality.

Named after the 21st address line (A20), controlling the access to HMA.



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\
A#
A-0
a1
A1 security
 base memory
extended memory manager
high memory area
HIMEM
QEMM386
 A-3
A3D
a56
AAC
AADL