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echo: 80xxx
to: DARRYL GREGORASH
from: JEFF BRIELMAIER
date: 1997-12-23 07:12:00
subject: Code in Boot Sector

DG> TH> However, there are BIOS areas that an operating doesn't mess
DG> TH> with, and that's because it is very specific to the
DG> TH> hardware, ie. a particular motherboard chip set, or video
DG> TH> chep set, or a non-IDE interface like SCSI.
DG>Do you think that 32-bit operating systems like OS/2 and WinNT would
DG>use real mode BIOS calls? I would be amazed if they do; more likely 
DG>they replace the entire BIOS routines with their own drivers, written 
DG>specifically for the particular hardware.
About the only part of the BIOS that most "modern" (non-MS-DOS) O/S's will 
still call directly after they are loaded is the Power_Management code (if 
they support PM).
The O/S's will make a number of BIOS calls early in their loading to find out 
what's in the system (like how much memory).  But they quickly load in their 
protected mode kernel.  At that point, they switch the processor to protected 
mode and leave the BIOS behind.
 * KingQWK 1.05 # [PK] * WOMAN.ZIP...Good utility...no documentation
--- Maximus/2 3.01
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* Origin: COMM Port OS/2 juge.com 204.89.247.1 (281) 980-9671 (1:106/2000)

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