Components

This is basic board (3-input germanium NAND with indication if all inputs are 1s) that will be used here (and there #Clockwork germanium ):

Manufactured by oshpark.com

Another thing was taken from old Soviet phone (and sold to me through eBay ; ):

This one will be used to input decimal digits into calculator ;)

UPDATE (04/22): Soviet nixie tubes have arrived :)

Discussions

Yann Guidon / YGDES wrote 04/22/2016 at 03:05

Oh yeah, i'll have to use that kind of dials one day :-D

Do they exist in hexadecimal ? :-P

Are you sure? yes | no

SHAOS wrote 04/22/2016 at 03:20

never seen anything different from decimal one ;)

Are you sure? yes | no

flashcactus wrote 04/22/2016 at 09:03

don't think so, this type of dial was invented for pulse-dial telephones specifically, and pulse-dial is a pretty inefficient avriable-length encoding not used anywhere else (but ideal for electromechanical automatic switchboards). anything computer-ish would have used keyboards from the start.

Are you sure? yes | no

Yann Guidon / YGDES wrote 04/22/2016 at 09:34

It seems I'll have to limit to octal then :-D

Are you sure? yes | no

SHAOS wrote 04/22/2016 at 14:02

Nope, I remember a number of circuits from my childhood where
pulse-dials were used to enter digits into digital system built from TTL
chips ;)
BTW I plan to use rings of flip-flops to represent decimal
digits, so "pulse-dial" wheel looks like a natural choice from this point of
view :)

Are you sure? yes | no

flashcactus wrote 04/22/2016 at 14:05

I suspect those were more a consequence of the wide spread of PD telephones than anything.

Are you sure? yes | no

Actual Germanium Modules

Discussions

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