It doesn’t happen usually that we report on new vacuum tube based computer system layouts. Nowadays even so, we’re happy to introduce to you the Rapid Dependable Electronic Electronic Dot Computer system, or Fred.Personal computer for small. It is the brainchild of [Mike] who also brought us ENA, which we highlighted previously.
Fred is a new design and style that reuses the sections that created up ENA. It has an 8-bit CPU, 16 bytes of RAM, 256 bytes of NVRAM, and operates at a clock pace of 11.3 kHz. With its 560 tubes drawing a complete source recent of about 200 A it also presents a fair bit of heating to [Mike]’s analyze. The key logic is carried out by means of NOR gates, built from 6N3P twin-triode tubes sourced from Jap Europe. These NOR gates are blended into extra elaborate structures like latches, registers and even a complete ALU. A total of sixteen machine code recommendations can be employed to publish plans clever style lets Fred to accomplish 16, 32 or even 64-bit calculations with its 8-bit ALU.
An exciting addition is a new RAM design based on reed relays. [Mike] realised that relays are in fact quite identical to electronic transmission gates and can as a result be employed to make a easy static RAM mobile. If you imagined relays have been as well sluggish for RAM cells, imagine yet again: these reed relays can toggle at a mind-boggling 700 Hz, building them far more than quick sufficient for Fred.
The principal I/O machine is a console that contains several pushbuttons as nicely as a 12 x 8 LED screen. All of this would make Fred a entirely-purposeful standard-intent computer which is even capable of participating in Pong (movie, embedded beneath). [Mike]’s web page is full of attention-grabbing detail on all factors of vacuum tube laptop design, and makes pleasant looking through for any person tempted by the plan of developing their own.
Cannot get enough of vacuum tube computer systems? Have a glance at this 1-little bit MC14500 implementation, marvel at this modern day interpretation of an introducing equipment, or discover out how IBM created its logic in the 1950s.