The VOL of this “ROM” already violates the TTL specs of VIL of 0.8V(Max). Forward drop 0.6V + 74LS139 VOL 0.3V = 0.9V. If the silicon diode were to be replaced with LED, all the outputs would ...

Circuit simulation made easy A free online environment where users can create, edit, and share electrical schematics, or convert between popular file formats like Eagle, Altium, and OrCAD. Transform ...

Diode matrices were one of the first methods of implementing some sort of read only memory for the very first electronic computers, and even today they can be found buried deep in the IPs of ASICs … ...