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Index > OS Construction > Asserting the #A20 Gate.

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Hayden



Joined: 06 Oct 2005
Posts: 132
Hayden
A20GATE.ASM Very Happy 2 passes, 96 bytes
Attempts to enable the #A20 line for access to the HMA from realmode code

Created by : Hayden McKay - build (j)54177

Note: * [BX] [CX] will be destroyed * [AL] is non-zero on success

Thanks to Ralf Brown's port list reference ports.a and other various recorces on the internet!

note: not many PC's support HMA acces for hardware. ie: hardware will probably fail if you use ffffh:10h - ffffh:ffffh for device buffers.

I've read someware that you can test for hardware HMA suppot though.


Description: Zipper friendly - readme updated
Download
Filename: #A20GATE.zip
Filesize: 1.45 KB
Downloaded: 82 Time(s)


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New User.. Hayden McKay.


Last edited by Hayden on 17 Mar 2007, 17:57; edited 1 time in total
Post 14 Mar 2007, 05:15
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tantrikwizard



Joined: 13 Dec 2006
Posts: 142
tantrikwizard
Come on Hayden, use a zip file already.
Post 14 Mar 2007, 14:15
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HyperVista



Joined: 18 Apr 2005
Posts: 691
Location: Virginia, USA
HyperVista
I've used zip exclusively for many, many years, but have to say that 7zip is absoultely outstanding. Greetz to Madis731 for turning me on to 7zip during the fasm meeting in Krakow. I strongly recommend giving it a try. It supports zip, rar, tar, cab, arj, lzh. chm, gzip, ... etc.
http://www.7-zip.org/
Post 14 Mar 2007, 14:29
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rugxulo



Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)
rugxulo
7ZA.EXE (cmdline version) works in Win32 or DOS + HXRT.

Or just use the DJGPP port of p7zip (but type CWSDPMI -x first if under pure DOS and use forward slashes in path names).
Post 16 Mar 2007, 00:54
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