COM (Ternary Gate)

Compare

Uses

A tree of compares can compute if a register is negative, zero, or positive. This is done as part of the ALU Flags.

I do not know yet if this gate is useful to Compare say two registers.

This gate is non-symmetrical. It is biased towards the A input. Only when A is zero does B have any effect.

Truth Tables

COM		B
		-	0	+
A	-	-	-	-
	0	-	0	+
	+	+	+	+

A	B	Y
-	-	-
-	0	-
-	+	-
0	-	-
0	0	0
0	+	+
+	-	+
+	0	+
+	+	+