18 lines
328 B
NASM
18 lines
328 B
NASM
;; test addition and substraction
|
|
; with direct addressing...
|
|
LDA $FE
|
|
ADD $01 ; $FF
|
|
ADD $01 ; $00 + CF=1
|
|
ADD $01 ; $01 + CF=0
|
|
SUB $01 ; $00 + CF=0
|
|
SUB $01 ; $FF + CF=1
|
|
; and with indirect...
|
|
LDA $01
|
|
STO $00
|
|
LDA $FE
|
|
ADD ($00) ; $FF
|
|
ADD ($00) ; $00 + CF=1
|
|
ADD ($00) ; $01 + CF=0
|
|
SUB ($00) ; $00 + CF=0
|
|
SUB ($00) ; $00 + CF=1
|
|
END |