Re: [colorforth] IDE bootloader to play with PC

[Samuel Falvo <falvosa@xxxxxxxxx>]

>         in AL,092h          ;\
>         or AL,2             ; Enable the A20
>         jmp $+2             ; for PS/2 and up
>         out 092h,AL         ;/

My PC reference says that the A20 gate is accessed through the keyboard
controller, and does not have its own unique port.

Also, I believe jmp $+2 no longer creates an appreciable delay.  I think an OUT
to some special port (0xE1 IIRC) currently creates the necessary wait states.

--
Samuel A. Falvo II


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