I am creating my first x86 assembly program. I am using VS Code as my editor and using Insight as my debugger coupled with DOSBox as my emulator.
As a start I have created a .asm program to change to colour of the screen:
global _start
section .text
_start:
call set_colour
ret 16
set_colour:
mov ah, 06h ; scroll up function
xor al, al ; clear entire screen
xor cx, cx ; upper left corner
mov dx, 184fh ; lower right corner
mov bh, 1eh ; yellow on blue
int 10h
ret
When I try convert this .asm file to a .o file DOSBox returns an error saying it cannot load the file. What am I doing wrong?
While DOSBox emulates a 32-bit CPU, DOS itself runs in 16-bit real mode, without tools like DOS4gw, used in some DOS Games, such as Doom.
I think the -f win32 command line option is to blame for this error.