Top "Real-mode" questions

x86 real mode is where a CPU begins execution.

Printing out a number in assembly language?

mov al,10 add al,15 How do I print the value of 'al'?

assembly x86 real-mode
CONCEPT OF MOV AX,CS and MOV DS,AX

Can someone please explain the functions of these three instructions? ORG 1000H MOV AX,CS MOV DS,AX I know …

assembly x86-16 real-mode memory-segmentation
What is the true difference between a real mode program and a protected mode program?

I know the difference between a real mode and protected mode from the OS and hardware perspective. But I am …

operating-system protected-mode real-mode
What are the segment and offset in real mode memory addressing?

I am reading about memory addressing. I read about segment offset and then about descriptor offset. I know how to …

assembly x86 x86-16 real-mode memory-segmentation
Looking for 16-bit c compiler for x86

I am working on porting uc/OS-II from DOS to x86 (real mode). I need: A compiler to generate real …

compiler-construction x86 real-mode
How to switch from real mode to protected mode after bootloader?

I just finished up a very bare-bones bootloader for my OS and now I'm trying to switch to protected mode …

x86 operating-system bootloader protected-mode real-mode
How to write to screen with video memory address 0xb8000 from real mode?

I created simple code to load second sector from hard drive, and then write to whole screen, with spaces with …

assembly x86 nasm bare-metal real-mode