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New Xeon's no A20. (Miscellaneous)

posted by RayeR(R) Homepage, CZ, 20.07.2009, 20:59

> In German C'T 13 (I lag a bit) there is a small note that newer Xeon's
> don't support A20 anymore.

What does it mean? I though that A20 is only one of 32 (or 36) address lines of CPU. It doesn't make sense they would released A20 pin from address bus coz it would mess up whole adressing. And about A20 control logic used in PC hardware - I though it is done by KBC (class 8042 MCU) or recetnly integrated in chipset. So I guess it is chipset incompatability (reducing legacy hardware) instead of CPU issue.

DOS gives me freedom to unlimited HW access.


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