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242 posts total
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Richardus

@tubetime Looks like a HDD controller on the picture. 😃

Take It EV Podcast 🎙️

@tubetime thanks for answering questions ! Is this going to be on githubs or such ?

Tube❄️Time

and we're live again, come check it out!

Tube❄️Time

guys, this bullshit needs to stop. if you find a bug, share your findings (and file a github issue) instead of trying to make a fast buck.

technically this also violates the open source license which requires you to distribute the source for any modifications you make to the original.

Correct Clone U33 PLD/Chip/PAL/IC V10 for Quapple Quadram Quadlink Not Like onGlthub a‘ retro_devices (439) 100% positive - Seller's other items - Contact seller PR A 71283A USs $19.99 Y yxyiy orBest Offer Condition: Used ® “Correct U33 PAL chip Clone for Authentic Quadlink CGA Picture Quality” ‘ Quantity: ‘ 1 ‘ 5 available
Item description from the seller

1 piece U33 PAL chip Clone for Authentic Quadlink CGA Picture Quality. Works. This chip provides identical quality to the original Quadlink CGA picture quality because it does not have the bugs present in the open source Quapple Github PAL jed files. These bugs degrade quality of the CRT image. In case you have an original Quadlink card or the chip from this listing you can compare the games/graphics looking better. Tested on a real Quadlink card with CGA monitor. The IC's batch code, or brand, or version could differ from the pictured. These are genuine vintage ICs -- not relabeled/remarked with soldered pins Chinese chips that are flooding ebay! In case you need other 16V8/20V8/22V10 chip(s) programmed, don't hesitate to contact and order them instead of the listed one. To be shipped from EU. Don't hesitate to ask questions -- | have a lot of vintage PC items from the same era. Thank you for reviewing this listing.
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Sinza Contoso

@tubetime The description looks like eBay AI generated nonsense.

This means I'm also not sure if it actually has a bugfix.

Evan

@tubetime It would be funny if it turned out the person was just cloning the original and so the open source license was not violated but the copywrite on the OG fw was.

Jeff Haluska

@tubetime It's a fairly niche hobby, why ruin your reputation in the community for such a low amount of money?

Tube❄️Time

Happy 37th anniversary of the Max Headroom Incident, to those who celebrate.

Low quality video screenshot of a person in a rubber mask and sunglasses in front of a diagonal pattern.
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Asbestos

@th
I had a Max Headroom watch I ordered off a thing of Coke or Pepsi

in ♥️ with PDA

@th Just a great series. As a kid I really believed that he was CGI

Tube❄️Time

playing around with Inkscape and my HP pen plotter. it's not really going that well; Inkscape has severe issues with locating the origin, scaling factors, and can't handle things like crosshatching. these are problems that were solved 40 years ago.

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DamonHD

@tubetime It's nearly 40Y since I last used a pen plotter (possibly HP), and those did indeed seem not to be problems by then...

Nick Poole

@tubetime as someone who has put a lot of hours into programmatically converting Inkscape-generated vector art into other formats, sometimes I can't tell whether Inkscape is underdeveloped or very opinionated. I love it. It's an amazing piece of software for $0. Unfortunately, that also means everyone uses it for everything, and it's not great at everything.

Jan Ciger

@tubetime For that sort of work you probably want to use something like QCAD (or maybe FreeCAD) and not Inkscape.

Inkscape is really a tool for vector art and not CAD. So no wonder those things don't work or work poorly - they are rarely an issue for typical Inkscape uses.

Tube❄️Time

ok, pretty happy with this now. Added a lot more filtering caps to try to reduce the noise and flicker, improved grounding (at least as best as you can on a breadboard) and tweaked the magnetic and electric focus a bunch more. I'm very happy with the result now!

For those wondering about the setup:
DIY HV supply is supplying 700V which is divided down for all the different electrodes in the vidicon tube, 600V on G5, 300V on G4 and G2, 65V on G3 for focus, -35V on G1 for beam current. 15V on the target. Raster is generated by two 555 timers set up as ramp generators and amplified/centered by two opamps. Output from the tube is amplified by a transimpedance amplifier, amplified again and then output straight to the Z input of the oscilloscope. There is no blanking during either vertical or horizontal retrace, neither on the vidicon nor output, which is less than ideal but works. Vertical frequency is around 40hz, horizontal around 10khz.

#electronics #vidicon #diy

ok, pretty happy with this now. Added a lot more filtering caps to try to reduce the noise and flicker, improved grounding (at least as best as you can on a breadboard) and tweaked the magnetic and electric focus a bunch more. I'm very happy with the result now!

For those wondering about the setup:
DIY HV supply is supplying 700V which is divided down for all the different electrodes in the vidicon tube, 600V on G5, 300V on G4 and G2, 65V on G3 for focus, -35V on G1 for beam current. 15V on the target....

Tube❄️Time

tonight's mini project: I built up this adapter board for testing IBM RAM chips in their odd little SLT package

Tube❄️Time

want to see some chip reverse engineering? tune in to my Twitch stream: twitch.tv/tubetimeus

Tube❄️Time

nobody:
F4 Phantom attitude indicator: OFF!

Tube❄️Time

wow remember these old DOS error messages?

C:\>

General failure reading drive C
Press <F> to pay respects:_
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DELETED

@tubetime @foone Who is this „General Failure“ and why is he reading my disk?

Piloot

@tubetime Who is General Failure and why is he reading your drive C:?

0++0

@tubetime
Might be the cable and it's connections have rusted, if the disk can't be read. Don't remember that exact message.

Tube❄️Time

the power supply in my PS/2 model 80 stopped working, so it's time to remove it and fix it. three screws and it even has a nice little handle in the form of a zip tie.

Tube❄️Time

looks like it might be the power switch. I'm expecting less resistance than this.

Tube❄️Time

got a cracked 8042 on this IBM PS/2 model 80 type 2 motherboard, but I'm going to try to dump it anyway! 🧵

Tube❄️Time

managed to desolder it. the extra tape is to stabilize it, because...

doragasu

@tubetime Wow, what could cause that massive crack? Shock? Extreme temperatures?

Tube❄️Time

today's mystery chip: the EM256SC8, made by Eagle. what is it?

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Григорий Клюшников

I'm a software person so I might be entirely wrong, but how could this be a RAM chip with just 16 pins? If it's 256 kbit like others are saying, you'd need 15 address lines, 8 data lines, power, ground, chip select, and read/write signals. So at least 27 pins. Unless it uses some kind of serial protocol, but is that even a thing with RAM chips?

UpLateGeek

@tubetime well, it’s not a dirty word (or, indeed, a dirty bird).

Sorry, I always think of that song every time I see the word eagle. I’ll show myself out.

Tube❄️Time

The F-4 fighter plane used an attitude indicator to show the plane's orientation. The ball in this indicator rotates in three axes. How does that work? We took the indicator apart to find out.
Spoiler: the ball is two hollow hemispheres, rotating while the "equator" stays stationary. Keep reading for details...
1/N

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Paul_IPv6

@kenshirriff

f-4 was an interesting plane.

when i was in the air force, pilots used to joke that the f-4 was living proof of the rule of aerodynamics that given sufficient thrust, even a brick could fly. downside was that when the f-4 lost thrust, it reverted to brick.

but they had a long and pretty solid life span in service.

Tube❄️Time

I wonder what resistor value used to go here. (when you see it)

Tube❄️Time

Here is an IC mystery
When did TI make plastic TTL with the logo
embossed into the divot?
It seems VERY unlikely they were making epoxy bodied ICs in 1965

A picture of two TI plastic TTL SN7475N ICs with an 0565 date code. The pin 1 divot has a TI logo embossed into it.
Philip Bragg

@bitsavers They look too narrow, too. I'm getting strong "soviet bloc" package vibes from these. CEMI and TESLA had those long divots. I reckon these are re-marked parts. '65 seems too early.

Bread80

@bitsavers I have no relevant knowledge knowledge but I wonder if this could be from a time when prices where high and there was enough margin to pay the higher manufacturing cost. The 3D logo would flaunt the technical advances and make them harder to clone.

Tube❄️Time

i made a replacement standby battery pack for my Thinkpad 700C!

Tube❄️Time

a friend of mine just booted Linux on an Intel 4004! (yes, the first microprocessor)

dmitry.gr/?r=05.Projects&proj=

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Eric Carroll

@tubetime
Is this not the very definition of virtuoso?

Wow.

Using a 2.5MB yes MB Linux kernel. I didn't think you could config Linux down that small.

Wow.

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