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I've been stuck with this for weeks now and have no idea where I'm going wrong because NASM hasn't given me any errors. The code is pretty self explanatory because of the comments. this is the code that is loaded from the BIOS ;-------------------------------------------- ; 'boot.asm' ; loaded from BIOS [org 0x7C00] [bits 16] ;-------------------------------------------- main: mov ah, 0x0E ; print function mov al, '.' ; ascii char int 0x10 ; IO int resetdisk: mov ah, 0x00 ; reset function mov dl, 0x00 ; drive int 0x13 ; disk int jc resetdisk readdisk: mov bx, 0x8000 ; segment mov es, bx mov bx, 0x0000 ; offset mov ah, 0x02 ; read function mov al, 0x03 ; sectors mov ch, 0x00 ; cylinder mov cl, 0x02 ; sector mov dh, 0x00 ; head mov dl, 0x00 ; drive int 0x13 ; disk int jc readdisk jmp [es:bx] ; buffer ;-------------------------------------------- times 510 - ($ - $$) db 0x00 db 0x55, 0xAA This is the code that should be (but isn't) loaded ;-------------------------------------------- ; 'load.asm' ; loaded from 'boot.asm' [org 0x8000] [bits 16] ;-------------------------------------------- main: mov ah, 0x0E ; print function mov al, '.' ; ascii char int 0x10 ; IO int jmp $ ; hang Any help would be much appreciated. Patrick

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