Stop and restart

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Stop and restart refers to a type of signal circuit where an input signal is converted into a stationary object, which is then re-activated by a secondary input signal. This can be used either as a memory device storing one bit of information, or as a simple delay mechanism. In the following January 2016 example by Martin Grant, a ghost Herschel marks the output signal location, and a "ghost beehive" marks the location of the intermediate still life.

x = 57, y = 58, rule = B3/S23 55bo$54bo$54b3o12$12bo$12b3o$15bo$14b2o$8bo$7bobo7b2o$7bobo6bobo$5b3ob 2o5b2o$4bo$5b3ob2o$7bob2o4$2o$bo$bobo$2b2o2$20bo$19bobo$19bo35bo$20bo 32b3o$36b2o15bo$2bo33b2o15bo$2bobo$2b3o$4bo20bo$24bobo$24b2o$19b2o12b 2o$19b2o12bo$34bo$33b2o7$2b2o$3bo$3o$o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GRID THEME 6 THUMBSIZE 2 THUMBLAUNCH ]]
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RLE: here Plaintext: here

The eater 1 in the lower left corner catches the restart glider if no input signal has come in to create the beehive. This eater could be removed if it is useful to have both a "0" and a "1" output for a memory cell mechanism.

The catch and throw technology in a Caterpillar is a somewhat similar idea. See also stop and go and reanimation.

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