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Post AuvT2oKe3iFc45OZl2 by [email protected] |
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More posts by [email protected] |
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Post #AuvT2elZcjqiOhuwLI by [email protected] |
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Began building two (because, why not?) TK2000 Apple 2 clones: https://github.co… |
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Post #AuvT2et1B3nulnOswi by [email protected] |
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Fun experience with the clock oscillator circuit in the TK2000 clone.First of a… |
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Post #AuvT2ezkm1Bx6gYGRc by [email protected] |
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Current state of the TK2000 boards.I can start filling the logic in and test th… |
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Post #AuvT2f6qLerZSfrvUm by [email protected] |
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Hmm, I suspect this is what they used for the EAR/MIC connectors: https://www.a… |
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Post #AuvT2fEzrLNvrxgRCi by [email protected] |
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The TK2000 has a footprint for a D-SUB 9 pin connector to provide power to the … |
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Post #AuvT2fLjSIlyCqpohc by [email protected] |
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For the record, a fully populated (minus some connectors) board like this, no e… |
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Post #AuvT2fS74ZsQWdoueG by [email protected] |
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Good news!The angled edge connectors I bought on AliExpress are a perfect fit f… |
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Post #AuvT2fYqfXGSrWyI9A by [email protected] |
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Finally! Ok it wasn't the crystal (even though using the wrong one brings o… |
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Post #AuvT2ffaGUeVCQ7fe4 by [email protected] |
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Given that the TK2000 is actually a clone of the Microprofessor II, it boots th… |
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Post #AuvT2fmJrS2XXJH38y by [email protected] |
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After some dremeling, I was able to fit these https://aliexpress.com/item/10050… |
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Post #AuvT2fu7OSHJvUvHIe by [email protected] |
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Key matrix routed. Now need to have some fun with the silkscreen. But that'… |
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Post #AuvT2g0V0jNmFHuNFI by [email protected] |
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The color burst killer circuit in the #TK2000 has a fixed cap (of unknown value… |
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Post #AuvT2g7aaN3ObHE2IS by [email protected] |
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The keyboard for the #TK2000 is almost ready, but it's not the only board I… |
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Post #AuvT2gF28h0ayMhyts by [email protected] |
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The other is a small bus extender for the TK2000. Why limit oneself to a single… |
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Post #AuvT2gM7iKgDKM1dx2 by [email protected] |
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A bit better.The IRQ and DMA chains were fixed, I added pads for 5V and GND, ju… |
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Post #AuvT2gSrJI4FfFB1Rw by [email protected] |
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The PJ-301M are indeed a good fit for the remaining connectors on the #TK2000 |
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Post #AuvT2gZEvZAhz2A7Oa by [email protected] |
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Ffff. Spotted another two problems:1st. One resistor in the cassette input circ… |
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Post #AuvT2gfcXqHAIp9DLE by [email protected] |
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gaaah, another one.This inherited from the original schematic.This resistor sho… |
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Post #AuvT2gm0A7Nccc8JHs by [email protected] |
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Well could be worse. Could also be better, like it could succeed. |
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Post #AuvT2gsNmOU4wP7PEW by [email protected] |
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Finally.This thing supports both 4164 and 4116 DRAMs. You can apply 5V on pin 9… |
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Post #AuvT2gyPPzIxF5wDcu by [email protected] |
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Keyboards?Where we're going we don't need keyboards.I have now memorize… |
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Post #AuvT2h4n2GPPYsvJZY by [email protected] |
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And defender loads. Yeeeh.With wrong colors it seems, but that's expected: … |
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Post #AuvT2hAShAwhqTZqPg by [email protected] |
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Uhnf. I'm left with a very curious and annoying issue with the TK2000: colo… |
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Post #AuvT2hGUKlla9AOeo4 by [email protected] |
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A teeny tiny bit of smoothing (147pF, just because I found my 150pF caps 10 min… |
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Post #AuvT2hNDvj9cU3Y2Iy by [email protected] |
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Ok, I was looking at my (paper) notes on the build of the TK2000.They have reac… |
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Post #AuvT2hUJVMpEq2rhM8 by [email protected] |
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As promised, here are the build notes for the #TK2000 https://github.com/hkzlab… |
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Post #AuvT2hcT13LbFKgD44 by [email protected] |
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Ok, I know I promised I wouldn't do anything on this until I got back the P… |
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Post #AuvT2hiUeeATY1V1SS by [email protected] |
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The edge sockets for the TK2000 extender came in today. PCBs are still in China… |
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Post #AuvT2hpwCy7fv6yy3s by [email protected] |
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As expected, this is an output of minimization for the P6 (13 sector version) R… |
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Post #AuvT2hx1mbnIH6Id72 by [email protected] |
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@hkz You're probably aware that you only need the 16-sector state machine P… |
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Post #AuvT2i2hRWKaYgx9xA by [email protected] |
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@brouhaha @hkz hmm now you've got me thinking about how to replace 256x8 bi… |
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Post #AuvT2i8j579SrNlyLY by [email protected] |
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@tubetime @brouhaha @hkz I ended up replacing the two PROMs for the Lisa clone … |
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Post #AuvT2mGJkpbJe5M5jc by [email protected] |
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Grand, the PCBs for the #TK2000 bus extender, the keyboard and the NES CIC repl… |
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Post #AuvT2nZUt0XLhrKvGi by [email protected] |
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Sheesh, not enough coffee. I fucked up both the DMA and IRQ priority chains in… |
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Post #AuvT2oKe3iFc45OZl2 by [email protected] |
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Time to start working on the interface drive card for the TK2000... |
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Post #AuvT2qOGPEKkRt6Ufw by [email protected] |
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Updated the build notes on the #TK2000 https://github.com/hkzlab/TK2000_Build_N… |
