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keybuf equ 0040h:001Eh
absolute 5000h
label:
section .text
absval equ 1000h
org 0x100
; Using seg should yield the segment part.
mov ax, seg keybuf
mov ax, seg (0040h:001Eh) ; NASM doesn't understand this syntax
mov es, ax
; Use without seg should yield just the offset part.
mov bx, keybuf
;mov bx, 0040h:001Eh ; Illegal
; Each of the below pairs should be equivalent (and legal) in Yasm.
; There are some differences from NASM here!
; Defaults to near jump (on both NASM and Yasm)
jmp keybuf
; Direct far jump.
jmp 0040h:001Eh
; Force near (non-far) jump (just offset, no segment).
jmp near keybuf
jmp near 0040h:001Eh ; Illegal in NASM ("mismatch in operand sizes")
; A couple of jumps to "normal" absolute addresses.
jmp 0x1e
jmp 0
jmp absval
jmp label
; Non-absolute jump
label2:
jmp label2
; Non-relative access
mov ax, [0]
mov ax, [label]
; Direct far, explicitly.
jmp far keybuf ; Illegal in NASM ("value referenced by FAR is not relocatable")
jmp far 0040h:001Eh ; Illegal in NASM ("mismatch in operand sizes")
keybufptr:
dw keybuf ; offset part
dw seg keybuf ; segment part
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