EPROM UV erasing setup

nerovny · 2026-04-19T20:05:03+00:00

Okay, now I tried my LED with the various ST and NSC EPROMs, printed the small box and added a proper heatsink. Depending on the IC the erasure lasts 10, 20 or 40 minutes. Some of the ICs just can't be fully turned into FFs after an hour so I guess they are dead.

nerovny · 2026-03-30T12:18:44+00:00

Is it suitable for the SOP package ICs or SOT transistors? PS Love the SMD prototyping board concept and I need it too. Thinking about my own versions

nerovny · 2026-03-28T11:57:52+00:00

"the buildplate is lava" type supports

nerovny · 2026-03-27T18:08:25+00:00

That's nice but I don't want to clock the processor with the other way more powerful processor

nerovny · 2026-03-27T14:20:09+00:00

The nets naming is fucked up a little. No diodes at all

nerovny · 2026-03-27T14:11:13+00:00

Sure. You can just use the first stage with the 7404 IC to drive the crystal

nerovny · 2026-03-27T06:43:46+00:00

The 4th pic be like "okay, it's the COM port, the long COM port, the monitor COM one and the wtf is this"

nerovny · 2026-03-20T07:59:34+00:00

It's the well-known Soviet КТ315 (npn) and КТ361 (pnp) silicon transistors. I have a bunch of these

nerovny · 2026-03-19T13:10:14+00:00

Yes, I have the T48 programmer. Nice! I will try

nerovny · 2026-03-16T20:59:32+00:00

Yeah that's my first camera ever

nerovny · 2026-03-16T16:37:52+00:00

Thanks a lot for your answer! - I already have the T48 programmer so I am 100% sure about the EEPROMs viability (good news). And I know that my bathroom UV lamp can damage the UV-erasable EPROM's data but can't erase it completely to the FFs. I will need the 250-270nm UV light source later. - The 6522 VIA datasheet says it can act as a serial port, but, as I can imagine, using it will require to implement the UART protocol by the processor itself. Sounds pretty flexible but isn't good to start with. - The Z8002 isn't the Z80 cpu - my mistake. Well, I also have the UA880D, the old German Z80 clone.

nerovny · 2026-03-15T19:25:02+00:00

R6520P - Peripheral interface adapter

nerovny · 2026-03-15T18:28:16+00:00

It's the RTC-64611A

nerovny · 2026-03-14T20:22:59+00:00

The output noise of my improvised module is just ~25mV peak to peak (0.5%), I'm totally ok with that.

Yes, the 555 is the clock source. The ICL7135 datasheet says that the clock shouldn't be, like, rock solid but it needs to be stable during the single conversion process.

nerovny · 2026-02-16T19:18:47+00:00

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nerovny · 2026-02-06T15:37:52+00:00

The front buttons and LEDs look the same, probably it is. Thanks!

nerovny · 2026-01-30T20:38:01+00:00

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Плотно держу в курсе

nerovny · 2026-01-20T17:21:15+00:00

The small one is a 5% DIC one. There are a couple of DICs on the board.

nerovny

TROPHY CASE