1 keybuf equ 0040h:001Eh 2 3 absolute 5000h 4 label: 5 6 section .text 7 absval equ 1000h 8 9 org 0x100 10 ; Using seg should yield the segment part. 11 mov ax, seg keybuf 12 mov ax, seg (0040h:001Eh) ; NASM doesn't understand this syntax 13 mov es, ax 14 15 ; Use without seg should yield just the offset part. 16 mov bx, keybuf 17 ;mov bx, 0040h:001Eh ; Illegal 18 19 ; Each of the below pairs should be equivalent (and legal) in Yasm. 20 ; There are some differences from NASM here! 21 22 ; Defaults to near jump (on both NASM and Yasm) 23 jmp keybuf 24 25 ; Direct far jump. 26 jmp 0040h:001Eh 27 28 ; Force near (non-far) jump (just offset, no segment). 29 jmp near keybuf 30 jmp near 0040h:001Eh ; Illegal in NASM ("mismatch in operand sizes") 31 32 ; A couple of jumps to "normal" absolute addresses. 33 jmp 0x1e 34 jmp 0 35 jmp absval 36 jmp label 37 38 ; Non-absolute jump 39 label2: 40 jmp label2 41 42 ; Non-relative access 43 mov ax, [0] 44 mov ax, [label] 45 46 ; Direct far, explicitly. 47 jmp far keybuf ; Illegal in NASM ("value referenced by FAR is not relocatable") 48 jmp far 0040h:001Eh ; Illegal in NASM ("mismatch in operand sizes") 49 50 keybufptr: 51 dw keybuf ; offset part 52 dw seg keybuf ; segment part 53 54
