> The pmode ideas are good, but I think you missed the point.
>A normal, old-fashioned 8086 can be tricked into getting 65535 more bytes
>of memory than the normal 1 megabyte. This is accomplished
>by programming the keyboard controller on PC's to hold the A20 line
>high and then use the 8086's real mode address wrap "feature".
No, it can't. There are only 20 physical address lines on a 86/88. This
addresses 1 MB, no more. If you try to access FFFF:0010 it will wrap
around to low memory. 286s can address 16 MB and the A20 gate chooses
whether going past FFFF:0010 wraps around to zero or continues past 1 MB.
