Version 4
SHEET 1 880 680
WIRE 160 144 -32 144
WIRE 400 144 320 144
WIRE 48 192 -32 192
WIRE 160 192 96 192
WIRE 400 192 320 192
FLAG -32 144 A
IOPIN -32 144 In
FLAG -32 192 B
IOPIN -32 192 In
FLAG 400 192 D
IOPIN 400 192 Out
FLAG 400 144 C
IOPIN 400 144 Out
SYMBOL sti 64 192 R0
SYMATTR InstName negate
SYMBOL half_adder 240 96 R0
SYMATTR InstName X2
