Creating Custom Circuits

• After running the Demo, custom circuits can be created by
				 selecting 'New' from 'File' menu, and then using the 
				'Chips' menu to select the type of TTL chip you wish to
				 experiment with.
• A block diagram for the chip can be seen by holding down
				the option OR shift key, while selecting a chip from the
				menu.
• Wires can be added to the breadboard, ONLY when the power 
				is OFF.  Once placed, wires can be selected for deleting or 
				modifying by clicking on them.  A selected wire is 
				surrounded by an animated marquee. 
				On color machines there is a Color menu which allows you
				to change the color of selected wires, and to preselect the 
				color for wires before they are drawn.
• Wires can be modified by clicking and dragging on their ends.
• Chips can be relocated by clicking and dragging them to a new 
				location (within the confines of the breadboard).