python (12.9k questions)

javascript (9.2k questions)

reactjs (4.7k questions)

java (4.2k questions)

java (4.2k questions)

c# (3.5k questions)

c# (3.5k questions)

html (3.3k questions)

Questions - bios

BIOS Int 13h 08 DBT issue Bytes per sector code returns 0xF0 instead of 0x00 - 0x04

I was using int 13h 08 to load disk parameters and got an invalid value from the disk base table (dbt). The value in question was 0xF0. note: dbt is returned in es:di Reference to int 13h 08: https://...
test-img

TheNullPlayer

assembly

interrupt

x86-16

bios

fasm

Votes: 0

Answers: 1

Latest Answer

The code snippet in the question is wrong in the way it uses the segment registers. It's not possible to draw any conclusions about the F0-issue from it. However the same code on your GitHub repositor...
test-img

Sep Roland

VBE: why does my code not provide a linear frame buffer?

I am a beginner who is trying to implement simple graphics in VBE. I have written the following assembly code to boot, enter 32-bit protected mode, and enter VBE mode 0x4117. (I was told that the outp...
test-img

Charles Buchanan

assembly

graphics

x86

bios

vesa

Votes: 0

Answers: 1

Latest Answer

Have I correctly loaded a linear frame buffer, and, if not, how could I do so? In your code you just assume that the linear frame buffer mode is available. You should inspect the ModeInfoBlock.ModeA...
test-img

Sep Roland

UEFI Memory location

I am attempting to write an x86_64 PC emulator. I was wondering in what memory location the UEFI is mapped. I know that a BIOS is usually mapped from 0xf0000-0xfffff and 0xf0000000-0xffffffff. Is UEFI...
test-img

Ryan Ilari

emulation

bios

uefi

Votes: 0

Answers: 2

Latest Answer

UEFI is not loaded in a specific memory location. Something needs to be placed where the processor starts fetching instructions, and then SEC and PEI stages prepare for DXE to be uncompressed somewher...
test-img

unixsmurf

Posts

Questions

Blogs

Jobs