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226 posts total
Tube🍂Time

did you know that 100 years ago there were *electromechanical* radio transmitters?

these things are so crazy, you just have to read this

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Jarl Gullberg

@tubetime I saw the image and instantly thought "Grimeton!" 😆 glad to see I was spot on, it's a fantastically interesting museum to visit.

Tube🍂Time

New project release: this is a little adapter that plugs in between an IBM RS/6000 and a standard PS/2 keyboard. it injects a response to an RS/6000-specific command so that the machine will boot correctly and not generate a keyboard error.

github.com/schlae/RS6KB

Codepope

@tubetime I imagine it's the RS/6000 emitting “Let me die… let me" and the adapter returning “Not today, not foever” :)

Tube🍂Time

I'm working on a new FPGA project. this one is rather complex.

Tube🍂Time

I'm at the "blink an LED" stage of bringing it up.

bitsavers.org

@tubetime

Brain the size of a planet and all they
have me doing is blink an LED

Darryl Ramm

@tubetime
“Rather complex”… it connects to MicroChannel slots on two different computers.🙂

Tube🍂Time

Introducing the 13W3 Video Snake Oil.

because lots of the 13W3->VGA adapters out there aren't wired correctly, i made one that is universal! check it out at github.com/schlae/13W3

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Jima

@tubetime @Stormgren Neat!

I do remember that pretty much any 13W3-VGA adapter required that the monitor supported sync-on-green — does that rule apply to this?

(Granted, I had to offload my Sun hardware 12 years ago, and don't have any CRTs anymore anyway. 🥲)

gunstick

@tubetime I wonder if it would also work with a NeXTstation.

Zorin =^o.o^=

@tubetime I always found it nuts how the industry came up with this fancy connector which preserved impedance matching to an almost obsessive degree then didn't standardize the pinout making it incompatible between vendors.

An insane degree of effort to then just do it wrong!

Tube🍂Time

electronics flea market time! this one is at West Valley College in Silicon Valley.

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Joe Pasqua

@tubetime doggone it. I’m in Menlo Park this weekend but forgot that the FM was this morning.

Larzarus ☠

@tubetime We *almost* went today. Had plans and everything. But circumstances said no. Maybe next month. So glad its back.

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bitsavers.org

@tubetime

What is the origin of "boop" ie. touching someone's nose and going "boop" ??

Phil M0OFX

@tubetime Why does that CRT have an electrode in the centre? I've never seen one like that.

Tube🍂Time

i've released the design files for this Sperry Panaplex clock. the firmware isn't done, but the hardware basically is. see github.com/schlae/SperryClock

Phil M0OFX

@tubetime I love the animated test(?) pattern. Looks like a sine wave scrolling over the screen.

Darryl Ramm

@tubetime Hardly trying if it's not an MCA card 🙂

Tube🍂Time

here's a diagram of the pyrotechnic ignitor used to start the rocket motor of the Nazi V-2 ballistic missile.

Likely Ryan

@tubetime rather committed to their symbolism eh

Arthur Elsenaar

@tubetime What is the source of this picture? Fig.174 and in English instead of German.

Tube🍂Time

I've successfully repaired this Fluke 8840A bench multimeter!

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Norman Wilson

@tubetime Could you do it again or was it just a ... never mind.

JeffG

@tubetime curious, does this not have repair functions like continuity, diode check, etc. Been notiticing the bench ones are more measurement.

Foone🏳️‍⚧️

@tubetime nice. I've got a couple of those, but I'm not sure I have that specific model

xsspup :blobhaj_hearttrans:

@tubetime @foone Imagine finally find the only USB floppy drive in the IT supply closest to restore a long lost file, only to find that it has one of these suckers lock in it with no sign of the key.

Tube🍂Time

so i umm spent a bunch of money on this silly thing--a Pentium 90 CPU card for the PS/2 model 95. it was advertised as being working, but i have my doubts. 🧵

Tube🍂Time

someone's been hacking on the card, adding this bodge wire. it bridges 5V over to two pins on the CPU socket (AN1 and AN3) presumably to support a faster Pentium Overdrive.

Raven667

@tubetime this is cool. I miss my model 95 which I got for $10 from a junk shop and used as a Linux internet router and file server for many years. Loved that display and the power switch with a sliding cover, turning it on was like launching a missile 😁

David Glover-Aoki

@tubetime Man, I've been looking for one of those for a long time. Jealous.

Tube🍂Time

oh no! now i can't run old versions of OS/2!

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Chartreuse

@tubetime for some reason I thought 16 bit protected mode only existed on the 286 and wasnt preserved on the 386. Is that not the case?

Dantali0n :arch: :i3:

@tubetime this is going to save tons of die space and power though. Its one of the major things holding #X86 back. I think this quite fundamental change regarding backward compatibility is a direct response to #riscv . I suspect #ARM will soon follow

Tube🍂Time

0, 0, 0. haven't seen that in a long time. what a strange feeling.

Tube🍂Time

this is pretty close. after i took this photo i filed away some more and also sanded down the surface to get a smoother finish.

Tube🍂Time

@TechConnectify huh, the VCR's built in clock is displaying the same time that i use whenever i take a photo of a clock. 🤔

Glen Akins

@tubetime @TechConnectify I've modified all my clocks to display only that time all the time.

Tube🍂Time

running out of space in my gmail account, i learned a few interesting facts.

1. attachments are not reencoded, and the base64 versions are what counts against your storage limit.

2. threads with quoted attachments (like images) double count those images against your storage limit

3. the Google One storage manager can't order your messages by size

4. the storage manager won't let you delete messages, or even just attachments. it only deletes ENTIRE THREADS which i learned the hard way. 😭

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hammancheez

@tubetime @ReticentTurnip man its so hard to get into google cuz they only hire elite coders

Eli the Bearded

@tubetime I recall reading some speculate about the damage to Google this Gmail thing could cause. The storage costs of free email vs the user expectations.

Those are not easy keywords to search for a news story however.

DrScriptt

@tubetime #2 is worse than that.

Each non-pruned reply is an additional copy that dings your storage.

Top posting plus hiding below that MASSIVELY in outages each reply to include the full email thread from that message back to the original thread.

Yep, base64 takes 4/3 times the attachments normal size.

Tube🍂Time

remember that very large logic analyzer i got at the Electronics Flea Market last year? well, it broke again :(

(birdsite thread: twitter.com/TubeTimeUS/status/

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Dantali0n :arch: :i3:

@tubetime Does this do serial protocols as well? Ive been looking for a serial / parallel analyzer. The tla714/5 also look good but this has a very nice large screen

Ken Ryan

@tubetime
Brings back memories of ... Last week.

Yes, I still use one of these at work. Bought in 2009? Still works fine. We never, ever connect it to the network.

🐧💻Sergueil💻🐧

@tubetime :ablobcatheartsqueeze: :ablobcatheartsqueeze: :ablobcatheartsqueeze: :ablobcatheartsqueeze:

Tube🍂Time

how open Sun drive enclosure? well, I'll show you.

Tube🍂Time

find this particular hole in the air vents on each side at the back. poke something through to unlatch it.

Norman Wilson

@tubetime Oh yes, that's a fun one. I remember working it out by inspection.

Simon Frankau

@tubetime The double height version of this is super-obvious to open, almost like they're making up for this.

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