Re: [colorforth] IDE bootloader to play with PC

[Adam Marquis <adam.marquis@xxxxxxxxxxxx>]

I left the jump there for alignment,
and I got this A20 method from somewhere on the net,
never tested it tough, always played in low memory.
The port is 80h, from programming with parallel ports website.

I posted on FASM forum, here's the link:
http://fasm.sourceforge.net/forum/viewforum.php?f=11
Please everyone that is interested take a look, there's even a poll ;o)

Adam

Samuel Falvo wrote:

> >        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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