Not important, I just thought it'd be fun to write but: > Hello world in real mode is leveraging a bunch of code and data from the BIOS Not necessarily, you c

Not important, I just thought it'd be fun to write but: > Hello world in real mode is leveraging a bunch of code and data from the BIOS Not necessarily, you can avoid the BIOS calls by just copying the string directly to video memory: mov ax, 0xB800 mov es, ax xor di, di mov ah, 0x07 mov si, hello ;; Load character, if zero, jump to end otherwise store ;; character and color in video memory @@: lodsb test al, al jz @f stosw jmp @b ;; Halt and wait for interrupt @@: hlt jmp @b hello: db 'Hello, World!', 00h That's a total of 37 byes including the string.