Hello, I have problems with the following code (especially the line highlighted in red). The code assembles, but does not show anything.
If I do "mov al, 72", I can see yellow 'H' on the screen, so I cannot understand why the below code doesn't work.

; display string
mov ax, 0xb800
mov es, ax
xor di,di
; 0xb800:0000 - address of the first char on the screen

mov ah, 14 ; yellow

repeat strlen
mov al, byte [mystring+%-1]
stosw
end repeat

hlt

mystring db 'Hello world !!!'
strlen=$-mystring[/size]

Thanks,
Marek.

Try using a CS override or set DS

Revolution, you are wonderful !!!

Thank you for your incredibly quick and very helpful answers !!!

Marek.

Glad to be of service.