Procyon 2.0 Assembled

Procyon 2.0 has the same form factor comparing to Procyon 1.1


However, now the architecture has the ARM Cortex M3 system controller handling 2 USB ports, SDHC card interface, MIDI and service OLED LCD display.

FPGA and ARM FW images can be uploaded via USB interface or auto-programmed via SDHC. One USB port is TYPE A (HOST) and the other is USB OTG (TYPE A/B). Both ports can have USB HID devices (Keyboard/mice/gamepad), mass storage and/or wireless. USB HUBs are not supported by the current ARM FW.

Also the HDMI genlock now is on the board together with the composite video/CSYNC socket.


The card will undergo the trial runs

Back to classics. Final VCO is discrete design, but great performance!

The final VCO architecture was selected, designed and tested. It is not an all solid state VCO though. But despite multitude of components, it offers an excellent low noise performance, temperature stability. The tuning range is superior to the original discrete design. Increasing the tuning range reduced drastically the PLL lock time. Now it takes 2 seconds to achieve a full lock on the VDP scan mode change.

No spurs, ultra clean!


And a very important property of this design – it all works without a shield!

New solid state VCO. Success

The new all solid state VCO was tested. It is little bit noisy, but it has no external inductors to be shielded.

Despite elevated phase noise the HDMI image is very stable.


On the spectrum there are very distinctive spures.

The loop filter to be re-designed.



Final decision will be taken whether to use the discrete VCO or solid state VCO.


Preparing Next Generation Procyon

New solid state VCO (Voltage Controlled Oscillator) design will replace a fully discrete VCO (on the left card) in order to improve the DFM (design for manufacturability). VCO is a heart of the HDMI genlocked PLL module, which performance is essential to the stability and quality of digital image.


However, still quite a low of work is required on the VCO itself, due to the very high level of phase noise.

This is how it supposes to be:


Here is a very high solid state VCO noise:


So more work to be done on the new solid state VCO soon…

Procyon now runs MSX2 titles

Procyon now runs MSX2 titles. MSX2 VDP V9938 chip is implemented including the industry first “HDMI zero delay multi mode Genlock”! The full on the fly support of 50/60 Hz progressive and interlaced video modes was added.

MSX2 splash screen 50Hz


MSX2 slash screen running on Toshiba-FS-TM1. 50Hz


Space Manbow. 60 Hz.