TTL homebrew CPUs

dwight elvey dkelvey at
Sun Jul 15 11:50:15 CDT 2007

>From: Jules Richardson <julesrichardsonuk at>
>I'm still not up to speed with the theory, though - I can see how the ring 
>counter operates once one tube is lit, but I'm not quite sure how the 
>power-up initial status with only the first tube in each counter lit is 
>arrived at... (i.e. how is it guaranteed that only one tube fires, rather 
>than none or several? Is one tube chosen to have slightly different 
>characteristics to the rest in the ring or something?)

Use diodes.

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