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Video Configuration & RGB2VGA Setup

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The Leningrad-2 2025 Revision features an integrated onboard ZX_RGBI2VGA-HDMI converter designed by AlexEkb. This converter uses a powerful Raspberry Pi RP2040-Zero board to upscale the vintage ZX Spectrum video signal to modern displays.

Selecting Output: VGA vs. HDMI

The board can output video via either a standard VGA connector or an HDMI port.

1. HDMI Mode (Recommended)

  • Jumpers JP1, JP2, JP3: Must be left OPEN.
  • Resistors R24 to R31: You MUST replace the standard resistors with 270 Ohm values to ensure proper signal voltage levels for HDMI stability.

2. VGA Mode

  • Jumpers JP1, JP2, JP3: Must be SHORTED.
  • Use standard resistor values as specified in the original schematic.

Flashing the RP2040-Zero Firmware

To flash or update the video converter firmware via the onboard USB port, follow these crucial safety steps:

  1. Disconnect System Power: Turn off the main power supply of the Leningrad-2 computer.
  2. Open Jumper J9: Open/remove the J9 jumper. Crucial: This completely isolates the RP2040-Zero power lines from the main computer board, preventing back-powering issues and potential hardware damage during flashing.
  3. Connect USB: Connect a USB-C cable from your PC to the RP2040-Zero.
  4. Flash: Hold the BOOT button on the RP2040-Zero, plug it in, and drop the .uf2 firmware file onto the mounted drive.
  5. Restore: Unplug the USB cable, close/solder J9 back, and power on the computer.