@tubetime@mastodon.social
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tubetime

@tubetime@mastodon.social

vintage computers, tubes, the MOnSter6502, cross-sectioned electronic parts, capacitors, and other detritus. coauthor of http://nostarch.com/open-circuits

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mia, to random
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With the introduction of Dolby Surround 7.1 in 2010, Sony were eager to put out a full home theater system. One of their early models, the HT-A7.100, included a revolutionary evolution to the standard stereo jack: the 7.1 surround jack, allowing all 8 channels to be sent over one cable.

tubetime,
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@mia TRRRRRRRS it's also the sound it makes when you plug/unplug it with the speakers turned on

tubetime, to random
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another silicon valley electronics flea market thread!

tubetime,
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bunch of Apple II gear.

tubetime,
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a homebrew uhh something.

tubetime,
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plenty of ancient test equipment

tubetime,
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random expansion cards

tubetime,
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oooh a pxl2000!

tubetime,
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this has got to be the smallest scope screen ever

tubetime,
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substitution boxes

tubetime,
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classic Tascam deck

tubetime,
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vacuum tubes! see what neat ones you can spot

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tubetime,
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mice.

tubetime,
@tubetime@mastodon.social avatar

nice power cord lol

tubetime,
@tubetime@mastodon.social avatar

treasure chest! you'll never guess what's inside

tubetime,
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@t36s two hundred

tubetime,
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@MLE_online not sure but they have already sold

tubetime, to random
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i've gotten nerd sniped into helping fix the IBM 729 tape drive at the Computer History Museum...

tubetime,
@tubetime@mastodon.social avatar

this basically means i'm buried in IBM schematics that use a totally weird representation of logic gates.

tubetime,
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this particular version of the 729 has a whole bank of SMS cards -- IBM's Standard Modular System which uses germanium transistors. these came out before their (equally odd) SLT cards and modules.

tubetime,
@tubetime@mastodon.social avatar

here is one of the cards. this one is an "MH" card containing 4 PNP driver transistors.

tubetime,
@tubetime@mastodon.social avatar

if anyone wants to see the back of the card, it looks like this.

tubetime,
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i want to build a breakout system to make it easier to test these cards. they use a 16-pin connector with 0.125" spacing between contacts. at the local electronics store, i could only find this 44-pin connector.

tubetime,
@tubetime@mastodon.social avatar

my idea is to remove a few pins and cut the connector down.

tubetime,
@tubetime@mastodon.social avatar

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.

tubetime, to random
@tubetime@mastodon.social avatar

here's a neat and rare bit of hardware: the Comspec SA-1000 SCSI sidecar for the Amiga 1000!

tubetime,
@tubetime@mastodon.social avatar

here's the Comspec SCSI drive enclosure. it's a bit of a beast and supports two half height drives. Comspec was definitely Canadian; check out that mounting screw!

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