MacBreadboard™ is a TTL Trainer/Simulator
with a unique graphical interface.  It was designed  to 
emulate 'real world' digital trainers.
Although COLOR isn't required, you gotta see it!

Features:
							- Input Devices -
						    			•	logic switches
						    			•	data switches
											•  +5 volts and ground
											•	clock circuit (free run, pulse or step)

								- Output Devices -
											•	LEDs (logic indicators)
											•	7-segment displays
											•	buzzer
											•  logic probe

								- TTL Library -
											•	7400			Nand
											•	7404			Inverter
											•	7408			And
											•	7432			Or
											•	7474			D flip-flop
											•	7486			ExOr
											•	7476			jk flip-flop
											•	74139		Decoder/Demux
											•	74161		4-bit Counter
									  	•	74193		up/dn Counter
											•   and others

Block diagrams are available by holding down the shift 
		key or the option key when selecting a chip from the
		menu, or by double-clicking on an existing chip.