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May 11, 2021 Archives

Tuesday, May 11, 2021

CONTINUITY: Vacuum Tube Computer Part 12: Redesigning the Logic Unit and Building Buffers

After experimenting with an actual MC14500, it's decided to extend the design to support full binary arithmetic including carry, which on the original Motorola design requires lengthy bit-twiddling. Driving the resulting arithmetic and logic unit (ALU) will require more fan-out than the instruction decoder provides, so once again it's time to add buffer circuitry. At this point, the largely repetitive circuitry is complete, and it's time to contemplate the messy random logic which the ALU will require.

Posted at 11:43 Permalink

CONTEXT: Sidewinder — The Missile That Changed Air Combat

Posted at 10:15 Permalink

CONTINUITY: Bright Lights: The Story of Neon Signs

Geissler tubes filled with various gases that fluoresce when electrified were popular novelties in the 19th century, often made in whimsical shapes. If you have a Tesla coil, you really ought to have a few Geissler tubes which will light up in its vicinity without a wired connection. You can find them on eBay.

Posted at 08:55 Permalink

TRACKING WITH CLOSEUPS: The Joys of Surface-Mount Components

Posted at 07:59 Permalink