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Custom firmware for the GBSC-Pro video upscaler by Brisma.

Converts retro console video signals to HDMI up to 1080p with low latency, advanced color processing, and extensive customization options.

Based on RetroScaler/gbsc-pro, which is a fork of gbs-control by ramapcsx2.

Links

Manual | Discord | Video Tutorial

Features

Video Input

• S-Video and Composite (active processing via ADV7280)
• RGB: RGBS, RGsB, RGBHV with auto sync detection
• Component (YPbPr)
• VGA passthrough

Video Output

• HDMI up to 1080p
• Multiple output resolutions: 480p, 720p, 960p, 1024p, 1080p

Image Processing

• I2P (Interlace to Progressive): Motion-adaptive deinterlacing
• ACE (Adaptive Contrast Enhancement): Dynamic contrast/saturation
• Video Filters: Shaping filter, comb filter, CTI for S-Video/Composite
• Scanlines: Adjustable intensity and style
• BCSH: Brightness, Contrast, Saturation, Hue control
• ADC Gain: Y/U/V gain with persistent settings
• Color standard: ITU-R BT.601 compliant

User Interface

• TV OSD: On-screen display via STV9426 (4 themes: Classic, Dark, Light, Retro)
• OLED Menu: IR remote with key repeat support
• Web UI: WiFi-based control panel
• 36 Profile Slots: A-Z, 0-9 with per-input settings
• Developer menu: Advanced hardware settings and I2C commands

System

• Auto-switching: Automatic input detection
• Low latency: Real-time signal processing
• Preset system: Save/load complete configurations
• Volume control: PT2257 audio IC support

Components

gbs-control/

ESP8266 firmware - Main controller running on the ESP8266. Handles the TV5725 video scaler, TV OSD (STV9426), OLED menu with IR remote, web interface, and communicates with the ADV controller via UART.

adv-controller/

HC32F460 firmware - Secondary controller managing the ADV7280 (video decoder for S-Video/Composite) and ADV7391 (video encoder). Receives commands from the ESP8266 and controls the ADV chips via I2C.

adv-manager/

Python GUI - Desktop application for debugging ADV7280/ADV7391 registers via serial connection. Useful for testing video processing settings without reflashing firmware.

hardware/

Hardware resources - PCB design files (Gerber), BOM, datasheets for all ICs, and an ADV CLI simulator for testing without physical hardware.

Building

# ESP8266 firmware
cd gbs-control && pio run

# HC32 firmware
cd adv-controller && make

# Web interface
cd gbs-control/public && npm run build

Hardware

Pre-assembled kits available at Official Store.

Or build it yourself using the open-source design files.

Community

Create an issue or join the Discord.

Thanks

• @ramapcsx2 for gbs-control