Posted on Leave a comment

Manufacturer info page for Digifiz Replica for VW mk2

This post will be extended and improved while there is more info

As we sold many Digifiz Replica units on behalf of Duplux Production ( there are many common questions and corresponding answers should be. There will be some more info regarding the device.

As a Russian development, the original page of Digifiz Replica is on the Russian social network VK, here:

Also, I’ve created a Telegram page of Digifiz Replica some time ago:

Currently, here is an official Manual for Digifiz Replica on English:

Posted on Leave a comment

UltiSID is released

UltiSID is released publicly and is now tested:

UltiSID while testing
UltiSID while testing

You can also order PCBs almost assembled using JLCPCB order files provided in the repository.
New UltiSID is highly inspired by Kung Fu Flash – and commonly, it is a Kung Fu Flash with a special firmware(Kung Fu SID, included as a submodule)

Video: – small video of new hardware and software working on a real C64.

By the way, I have 4 extra chips and I can send/sell them somewhere if someone wants to check them out.
As it was declared initially, UltiSID is completely free and open-source even for commercial purposes (GPLv3 license)
I will be happy if someone will improve the project or add some new functions to it. It still lacks paddles, but new hardware supports it.
As well, there is an OpAmp on output cascade, and output is completely generated by DAC, not PWM as on SwinSID – which ensures smooth and good generation of sound. I still need some optimization of code.

There are no hard flaws as it was before on the previous revision of the hardware. It processes data and it is possible to read it back, it works stable.

I would also be happy for any donation:
PayPal is unfortunately banned in Russia, as Russia resident I am unable to use it, even if I’m not in Russia actually(as it is)
0xeDc17cb23241eACe19DF3617291aa7d2d92E62DC – USDT/ETH ERC20
0x77c411fdedc72b034432571ae9aee10330b72d6c – USDT BSC20 – or buy something here(my 3d models of C64 for 3d printing)

Posted on Leave a comment

Nano SwinSID manufacturing and test tutorial


In this tutorial, I’ve used information from as well as my own experience for testing.

You’ll not only know how to assemble & flash SwinSIDs, but how to do it almost automatically.

SwinSID is a microcontroller-based clone of the SID, the audio chip used in nearly all 8-bit Commodore computers in the 80s, and later in some chiptune synths like SIDStation. The original SID ( Sound Interface Device) was designed by the engineer Robert Yannes and produced by MOS Technology under the names MOS 6581 and MOS 8580 from the early 80’s to the early 90s. Despite the production of the original SIDs stopped years ago, you still can find spare units of unknown origin on some internet sales sites, but they are very expensive and usually have some of their parts damaged ( it is not strange to find units with malfunctioning filters or oscillators ).

Pinout of SID(and SwinSID too):

SID pinout

Ordering boards

Here we’ll order boards that they will become partly(or fully) assembled.

To order fully assembled boards I do prefer PCBWay (use, however you can use any other manufacturer.

Select necessary board number and select color of boards:

Turn on assembly service, enter necessary amount of boards and click “save to cart”, after that, you’ll be requested to update BOM, Pick and Place and gerber files.

Here they are(for full assembly):

Here they are(for manual header soldering, part assembly):

Payment, shipping and delivery

PCBWay accepts ordinary debit cards,  PayPal and wire transfer. It is also possible to order for a company, they provide all the necessary documents.

Shipping using E-packet takes almost one month to Europe and USA(almost everywhere)

In Europe you can pay VAT while the order and receive items with simplified customs clearance.

Soldering partly assembled boards

This is how assembled boards look from the factory

If you’ve ordered boards without DIP assembly, you’ll need 2.54 round gold-plated headers:

You can buy them here: Aliexpress headers


Adapter guidelines

Necessary tools for flashing: USBASP Cable + adapter

Socket for USBASP: USBASP wires

Now, you need to make an adapter for flashing using USBASP.

Please connect lines 5V, MOSI, MISO, SCK, RST, GND to the corresponding pins on the bottom of USBASP.

Now, please download the flashing pack (for Windows, but you can adopt BAT file for Linux too) :


Insert to C64 socket, boot up (you’ll hear a “ping” sound)

Install location of SwinSID

Try to load some music. If you’ve followed the instruction, you’ll hear the sound. Good luck!