Re: WANTED: list of useful BIOS locations

Article View: comp.os.msdos.programmer

Article #2886

Back to comp.os.msdos.programmer Previous Next

#2886

From: Robert Collins
Date: Thu, 01 Nov 1990 16:14

27 lines
1476 bytes

In article <90304.161727DLV101@psuvm.psu.edu> DLV101@psuvm.psu.edu (Dwaine VanBibber) writes:
>I'm looking for all those neat memory locations and what they do. For
>example, here are a few:
>
>ffff:0 - jump here for warm/cold boot
F000:FFF0 is preferable to FFFF:0

>ffff:fffe - machine ID byte
Probably just a type, but this address is above 1M.  Try F000:FFFE.

>????:???? - keyboard status word (numlock, scroll lock, etc.)
 0040:0017

>????:???? - stores address of beginning of video memory.
 0040:004E

>Does anyone know where I can find THE definitive list of the? A book or
>text file that someone has compiled will do fine. Thanks.

Try the IBM "Technical Referance Personal Computer AT" P/N 6280070, I
do believe this is the "definitive" list...since it is the source.

-- 
"Worship the Lord your God, and serve him only."  Mat. 4:10
Robert Collins                 UUCP:  ...!sun!altos86!rcollins
HOME:  (408) 225-8002
WORK:  (408) 432-6200 x4356

Technical Details

Message-ID: <4328@altos86.Altos.COM>

Path:

arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!julius.cs.uiuc.edu!apple!altos!altos86!rcollins

References: <90304.161727DLV101@psuvm.psu.edu>

Show Full Headers

Complete Article Headers

Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!julius.cs.uiuc.edu!apple!altos!altos86!rcollins
From: rcollins@altos86.Altos.COM (Robert Collins)
Newsgroups: comp.os.msdos.programmer
Subject: Re: WANTED: list of useful BIOS locations
Message-ID: <4328@altos86.Altos.COM>
Date: 1 Nov 90 16:14:01 GMT
References: <90304.161727DLV101@psuvm.psu.edu>
Reply-To: rcollins@altos86.UUCP (Robert Collins)
Organization: Altos Computer Systems, San Jose, CA
Lines: 27

Reply to Parent Message