Home/ Questions/Q 6956173
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-27T14:50:01+00:00

I’m starting to write a very simple OS right now, just the boot sector,

  • 0

I’m starting to write a very simple OS right now, just the boot sector, to get used to basic assembly. What is the best way to output text? I’ve tried :

int 0x10 ah = 0x0E

int 0x21 ah = 0x09

Int 0x10 is slow, and int 0x21 is a DOS call, and I’m trying to write a simple stand alone OS, so I don’t think this will work.

What other methods are there of going about outputting to the screen. In other words, what is the best method I can take of putting text on the screen, without using DOS interrupts?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Well, if you’re rejecting BIOS as too slow, then your other option is to write directly into video memory (segment B800h for color adapters, B000h for monochrome). Format is alternating character/attribute bytes. IIRC attribute 07h is standard white.

    • 0