Re: OLED replacement for AT case 'speed display'?

Posted on Today, 10:41

by

by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I am working on one right now that is ATTiny85 based that has a SSD1306 OLED. I'll post it in my turbo display project thread when finished. I'm also making a 3 digit and 3 digit+MHz alphanumeric display.

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Re: Moderator violating Community Standards

Posted on 2021-06-15, 01:52

by

by wiretap

in Milliways

in Milliways

Dang it, I always miss all the fun stuff.

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Re: Floppy ribbon cable length/extensions

Posted on 2021-06-11, 23:46

by

by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I had one at work hooked up to a Modcomp that was at least 10 feet away at the user terminal. We used it to backup the reel to reel tapes. They can go a pretty long distance.

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Re: I recently found this hardware, AKA the Dumpster find thread.

Posted on 2021-06-11, 18:36

by

by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

NOS Intel (and some Mitsubishi) 27C128 and 27C256 EPROMs that was in the scrap bin.. saved 'em. Already UV erased and programmed 1 of the 27C256 chips and it worked great. (for my Pi1541+EPYX FastLoader)

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Re: What retro activity did you get up to today?

Posted on 2021-06-10, 22:26

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Finished up my Sergey Super VGA card.

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Re: Keyboard not working

Posted on 2021-06-10, 18:20

by

by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So after a month of using the PC and the keyboard without issues, it failed again yesterday. This time I couldn't even get past the keyboard error at POST. Decided to take out the C151.. problem solved! I wonder how it gets bad over time and whether I should replace it. What do you guys think? They …

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Re: What retro activity did you get up to today?

Posted on 2021-06-10, 00:07

by

by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Erasing some 27C256 EPROMs. (10 of them) -- one pass of 60 seconds got 6 out of 10 fully erased. One more pass of 60 seconds of the remaining four erased those. The ST M27C256B's are the ones that required a little extra time for some reason. https://i.imgur.com/hjiRaIGh.jpg https://i.imgur.com/ …

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Re: Bought these (retro) hardware today

Posted on 2021-06-09, 19:36

by

by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Received my new-in-box InWin IW-V500T today (mATX mid-tower). Looks great and is ready for a retro build. PSU has a nice 5V rail, but I'll have to bench check it and take a look at the caps first.

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Re: Fabricating a New Turbo Display

Posted on 2021-06-08, 23:26

by

by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok, fully tested the this turbo display. It works great with MHz switching and turbo LED support! Video: https://youtu.be/Jka8PfParP4

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Re: Bulging Caps or just fat caps????

Posted on 2021-06-07, 01:32

by

by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Not to mention TV's from the 50's used very few can electrolytic capacitors since they were extremely expensive to produce. (over $80 each in today's dollars) They mostly used paper/wax electrolytic capacitors which would definitely dry and crack in a desert environment. They didn't even last long …

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Re: Bulging Caps or just fat caps????

Posted on 2021-06-06, 23:26

by

by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That's incorrect, since as they dry out, they get hotter during use and generate more hydrogen gas to begin bulging. If you pulled electrolytic capacitors out from not being used for 40-50 years, they would certainly need to be reformed at a minimum, but more than likely need to be replaced. They …

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Re: Bulging Caps or just fat caps????

Posted on 2021-06-06, 22:20

by

by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

They look fine to me. If they were bulging they would be out of the vent perforations at the top. The pressure required to bulge the main body would be more than is required to pop the cap on it's own. They're definitely bulging, you can tell the way the light is reflecting off the top. …

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Re: Bulging Caps or just fat caps????

Posted on 2021-06-06, 22:18

by

by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

To remove those, one of these cheap pair of hot tweezers makes it super easy: https://www.amazon.com/dp/B01M2YHJAB/ They have terrible reviews, but work absolutely fine after they heat up for 2-3 mins. Just tin the tips, place the tweezers on the capacitor pads, and they lift right off with zero …

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Re: Ideas for what kind of system to build with this InWin 500 case.

Posted on 2021-06-06, 12:21

by

by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I purchased from the same seller. 😜 I plan on putting an AMD K7 build in mine, or maybe a K6-III+.

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Re: List of open-source PC hardware projects

Posted on 2021-06-06, 10:59

by

by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You could if you didn't want to spend the $2 on 5 PCB's.

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Re: What's your favorite retro computing PC platform?

Posted on 2021-06-06, 02:00

by

by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Amiga is currently my favorite, just due to the amount of hardware/software mods available, and how modern you can mod them to perform. (CPU accelerators, retargetable graphics cards, sound cards, ethernet cards, RAM expansions, video editing/switcher boards, flash based IDE and SCSI, several …

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Re: Two Power Supplies, One Motherboard?

Posted on 2021-06-06, 01:46

by

by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Both power connectors should go to the same traces and voltage regulators. Nothing bad will happen if both power supplies are working properly at the same voltage/ripple. If the power supplies are too far out of spec with each other, one can potentially drag the other down and exceed the AT/ATX …

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Re: Cheapest way to erase an eeprom ?

Posted on 2021-06-05, 23:57

by

by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Necro bump. Just built one of these in a 50cal ammo can.. 25 watts of erasing power. Clears a 27c256 in about a minute 🤣. I can do maybe 30 chips at a time.

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Re: Bought these (retro) hardware today

Posted on 2021-06-04, 22:51

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Another one of these SCSI external CD-ROMs.. this time it came with the ridiculously hard to find PCMCIA cable. Only $15 too! Now I can use it with my old laptops,or use a HD50 to DB25 cable for my other retro computers that have SCSI. https://i.imgur.com/pvVd7TFh.jpg can't these just work with any …

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Re: Bought these (retro) hardware today

Posted on 2021-06-04, 21:09

by

by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Another one of these SCSI external CD-ROMs.. this time it came with the ridiculously hard to find PCMCIA cable. Only $15 too! Now I can use it with my old laptops,or use a HD50 to DB25 cable for my other retro computers that have SCSI.

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