#tk2000 — Public Fediverse posts

O Primeiro Leilão Oficial da Municipalidade de Retrópolis

https://retropolis.com.br/2026/07/16/o-primeiro-leilao-oficial-da-municipalidade-de-retropolis/

#Especial #MundoRetro #Notificaes #Alphasmart #AppleII #AppleIIc #atari #cartuchos #ChannelF #Commodore128 #Commodore16 #CommodoreVIC20 #FM7 #joystick #JR200 #Leilo #leiles #loja #MatraAlice #MC1000 #MInidisc #MSX #Odyssey #PC98 #Pong #sharp #SharpX68000 #Telejogo #TI994A #TK2000 #TK85 #TK90X #TRS80ColorComputer #TRS80MC10 #TurboR #Venda

Ok, given that the test for this board has been a (painful) success, I am releasing the #TK2000 #VDP board for everyone to enjoy!

For those that just tuned in, it adds a TMS9918A to your TK2000 home computer.

Why?
Because why not!

https://codeberg.org/hkzlab/TK2000_VDPboard

This project was sponsored by #PCBWay , that kindly printed the boards for me, and they turned out great!

That said, components and consumables are not free, so every credit you might wish to send me at https://ko-fi.com/hkzlab is going to be greatly appreciated! ☕

New small batch of boards for the #TK2000 sponsored by #PCBWay was just submitted!

The first two are experimental, we'll see if/how they work:
- TK2000 VDP board: to use a TMS9918 on the TK2000. Just because.
- TK2000 SRAM adapter, to try replacing the DRAM on the machine with SRAM

Then a new revision of the F.A.S.T.I.D.I.O. that makes the '245 driver and some glue logic optional (connecting the 6522 directly to the bus).

The next board to print for the #TK2000 is going to be the one with the TMS9918.

But I'd like to make a run of at least two boards. So what's going to be next?

Then, I think that I should really pick up the TK2000 motherboard and insert all the fixes I made on mine, swap a few connectors with easier to find ones, and publish it.

Maybe also sell kits? I mean, I'd like people to play with this computer.

It also needs a decent keyboard, not the shitty one I have with SMD keys.

Released the #TK2000 F.A.S.T.I.D.I.O. board!
https://codeberg.org/hkzlab/TK2000_FASTIDIO

It adds two (or just one) 6522 VIAs to your TK2000 computer. You gain timers and lots of I/Os. I'm currently using the board to interface with an SD card, and will try with a SNES gamepad soon-ish.

The production of the PCBs was sponsored by #PCBWay, so thanks to them!!!

As usual, if you like these things and wish to donate a few credits, you can do that at https://ko-fi.com/hkzlab .
#PCBWay may have sponsored the boards, but components are certainly not coming free!

First tentative placement and routing for the VDP/TMS9918 #TK2000 expansion card.

#TK2048 V2.0 for the #TK2000 (and #MPF2 ) home computer released!

https://codeberg.org/hkzlab/TK2048

This simple game is my test-bed for development with calypsi and for testing the expansion boards I'm creating for the TK2000.

This release is floppy-only, and actually includes the floppy routines I worked on recently to play around with my Disk Interface REDUX card.

As usual, if you like these hackeries and want to support them (PCB production, components, etc), feel free to throw a few credits at https://ko-fi.com/hkzlab ☕!

@hkz I've always wanted to assemble a PC from scratch, but have so far been intimidated. The Apple ][e was the first computer I learned to code on and seemed like a good candidate. I believe the #TK2000 is a clone? How compatible is it? With your new drive controller it can read software from Apple disks? And you say it's an easy build? Could be what I was looking for! Do they sell kits? Can you send me more info please? Thanks! 🙂

Here, enjoy a Floppy Disk Drive interface for the #TK2000 you don't (but could, it's an easy homebrew build!) have!

https://codeberg.org/hkzlab/TK2000_DiskInterface_REDUX

With this you get dual floppy support, and it works wonderfully with the FloppyEmu too!

A shout to the guys at #PCBWay , because this board run was sponsored by them, so this card got released way sooner than expected thanks to them. And it doesn't end here, I still have another project to thank them for. You will see something more in the next days!

Well then, my first repo on #codeberg

Here is the #TK2000 bus extender for all to enjoy!

https://codeberg.org/hkzlab/TK2000_bus_extender

The TK2000 Disk Interface REDUX will follow soon(ish).

Yup, after some bodging, the #TK2000 is booting off floppies!

Well, sort of, off a floppy emu.

The drive card will need another revision to get to a final one, but there should be no surprises.

I have quite a few project ideas, but before getting to those, I'll go for some #TK2000 fun in the coming weeks!

Well, I finally screwed down the #TK2000.

Guess I can say that with a decently long cable it is usable in bed.

Sorry for the feet. It was a long long day.

Oh yes, got calpysi to behave and generate a valid binary for the #TK2000!
I can now load it via the tape interface, and it also includes a BASIC stub so it can run by simply typing "RUN" once loaded.

Now, if I had a way to generate the tape in a format that can be loaded with the "LOADT" command...

Updated the build notes on the #TK2000
https://github.com/hkzlab/TK2000_Build_Notes

The zeners came in, I tested 11V ones in series with these resistors and they seems the system activates the remote control ports correctly using ttl level outputs.

Grand, the PCBs for the #TK2000 bus extender, the keyboard and the NES CIC replacement arrived in Italy! I might be able to get them by next week.

Can't wait to go on with this project!

As promised, here are the build notes for the #TK2000 https://github.com/hkzlab/TK2000_Build_Notes

They'll be updated if (when) I find new things to fix, but for now, these should get you something very near a working machine.

Tomorrow I'll send the keyboard and bus extender out to print, and will take a break on this for a few weeks until the PCBs arrive, as I almost got burnt out in the weekend (which turned a "I'll test this, it'll take ten minutes" on Friday into a deep dive that lasted almost all weekend).

I have low-hanging fruits to pick (a 2DS XL with possibly a bad shoulder button) and books to enjoy!

The PJ-301M are indeed a good fit for the remaining connectors on the #TK2000

The keyboard for the #TK2000 is almost ready, but it's not the only board I want to get printed this round...

The color burst killer circuit in the #TK2000 has a fixed cap (of unknown value, as the original schematic doesn't say), while the (>rev.0) Apple II have a 47pF + a variable 5-50pF cap in parallel.

I originally put a 100pF in mine, but today I found that I still had some SMD variable caps around, so I replicated the circuit in the Apple II. Just needed to scratch some solder mask.

After some dremeling, I was able to fit these https://aliexpress.com/item/1005008453287975.html connectors on the #TK2000 clone motherboard.
For the remaining, I'm waiting for the PJ-301M to get here, but I think they'll fit.

In the meantime, I'm working on a simple passive keyboard replacement. Small and cheap to print, it should allow me to continue testing the clone and also start the other projects I have for it.