The Sega Master System outputs RGB natively on the Model 1, but the signal passes through the stock video encoder circuit which introduces jailbars and noise. The Model 2 has no AV output at all — RF only. The RGB bypass mod addresses both issues by pulling the RGB signal directly from the VDP, routing it through a high-quality THS7374 amplifier, and outputting a clean, noise-reduced signal through a proper AV connector.

The result is a noticeably cleaner picture with reduced jailbars and better compatibility with RGB cables, scalers, and upscalers. On the Model 2 this mod also adds a proper AV output port where none existed before.

Compatible with: Sega Master System Model 1 and Model 2. Sega Mark III.

Board sourcing cost (if Captain Retro sources your board): $55

The mod board required for this service is not included in the base price. You may source the board yourself or we can source it for you. Pricing reflects the selected option.

Dependent on parts availability. If you choose to have us source the board, your order depends on current supplier stock. If the board isn't available right away, we'll contact you with the expected wait and your options before moving forward.

This is a send-in service. No payment is collected at checkout — you will receive shipping instructions and invoice details via email within 1-2 business days. All consoles must be tested and confirmed in full working order prior to shipping. See our Shipping & Send-In Instructions page for details.

Master System / Mark III