A20 - a pain from the past
Everybody hates the CapsLock key, but keyboard manufacturers continue producing keyboards with CapsLock - it could be that someone wants it. With A20 it is similar but worse. Really nobody wants it, but it continues to haunt us. History The 8088 in the original PC had only 20 address lines, good for 1 MB. The maximum address FFFF:FFFF addresses 0x10ffef, and this would silently wrap to 0x0ffef. Wh
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Keyboard scancodes: The AT keyboard controller
A20/RESET ANOMALIES
A20-line Definitions | What does a20-line mean? | Best 1 Definitions of A20-line
Application Note 6-12 - FDC37C93x Tips: Enabling Gate A20 and Keyboard Reset and General Purpose I/O Options
