the final product. you can barely see the glue seam....

the final product. you can barely see the glue seam. bonus points to anyone who knows why the connector pin alphabet is missing a few letters. further bonus points to anyone who knows why each contact has two wires connected to it.

an IBM sms card plugged into my customized socket. the socket pins are wired up to a set of 16 test points marked "A B C D E F G H J K L M N P Q R"

Like 18 May at 0:58 | Open on mastodon.social

7 comments

prozacchiwawa

@tubetime the obvious answer with the letters is they're gonna leave out the ones that can be confused with numbers.

i'd imagine one of S or Z or both is left out as well.

oh -- or they're the symmetric ones that don't tell you if you're reading it upside down :-)

18 May at 1:05 | Open on functional.cafe

William D. Jones

@tubetime I and O too easy to confuse with 1 and 0?

I feel like I've seen this before in e.g. Game Genie codes.

18 May at 1:12 | Open on mastodon.social

Darryl Ramm

@tubetime

I != 1
O != 0

Two wires? Because you wanted to be able to insert boards either way? But why?

18 May at 1:15 | Open on hachyderm.io

Emily Velasco

@tubetime I have a front panel from some old electronic device that has the same letters removed

18 May at 1:25 | Open on social.afront.org

JeffG

@tubetime the missing letters can be mistaken for numbers!

18 May at 2:13 | Open on mastodon.social

Zack Stern

@tubetime I don’t see any traces on top of this card but my entry is: to get continuity on the top and bottom of the card at the same time. The leads go to teeth on one each of the top/bottom?

18 May at 3:34 | Open on hachyderm.io

Henning Paul DC4HP

@tubetime For the same reason they're omitted in MIL connectors, I guess, ambiguity.

18 May at 7:06 | Open on radiosocial.de

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