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jrfritz · Post by **jrfritz** » Thu Jan 02, 2003 1:10 pm

But I need that GDT.

jrfritz · Post by **jrfritz** » Thu Jan 02, 2003 1:12 pm

The GDT must be 16 bit...

hanoi · Post by **hanoi** » Thu Jan 02, 2003 1:45 pm

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jrfritz · Post by **jrfritz** » Thu Jan 02, 2003 9:55 pm

hanoi...that tripple faults the moment I jump to the 1 meg location.

No matter what code....it always tripple faults when it goes to 1 meg.

df · Post by df » Fri Jan 03, 2003 2:11 am

maybe you are not turning on the A20 line correctly?

hanoi · Post by **hanoi** » Fri Jan 03, 2003 4:16 am

enable_a20:
IN AL, 0x92
OR AL, 0x02
OUT 0x92, AL
ret
^^^^^^^^^
my A20-enable

Slasher · Post by **Slasher** » Fri Jan 03, 2003 12:45 pm

hi,
that method of setting the A20 will not work on all Pcs! first use the keyboard ports (get doc on keybords), then test if the A20 is set. if its not set then use your method stated above as a fall back.

OSDev.org

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