Connecting classic consoles to modern flat-screen displays often results in blurry scaling, heavy input lag, and aspect ratio distortion. The Open Source Scan Converter (OSSC) fixes these issues by processing analog video signals into crisp digital outputs with zero added lag.
The device bypasses standard television scalers, which are built for high-definition video rather than 240p or 480i signals. By multiplying lines directly on an FPGA chip, the OSSC delivers sharp pixels that make retro libraries look stunning on modern monitors.
Understanding the OSSC Architecture
The OSSC relies on pure line multiplication rather than heavy frame buffering. Traditional scalers capture an entire frame, scale it, and output it, which introduces several frames of delay.
[Console] -> (RGB/Component/VGA) -> [OSSC Input] -> [FPGA Line Multiplier] -> (HDMI/DVI) -> [Modern TV]
By processing individual lines on the fly, the OSSC maintains zero input lag. This speed is crucial for fast-paced action games, rhythm titles, and platformers where timing dictates success.
Input Options and Compatibility
The hardware supports multiple analog inputs, but it doesn't accept every cable type out of the box. Knowing your inputs prevents setup frustration.
- AV1 (SCART): Accepts RGB and YPbPr with sync-on-green. This is the primary input for European consoles and modded systems.
- AV2 (Component): Accepts YPbPr and RGB signals via RCA connectors. Ideal for PlayStation 2, original Xbox, and GameCube component cables.
- AV3 (VGA): Accepts VGA and RGBHV inputs. Commonly used for the Sega Dreamcast or retro computer setups.
- AV4 (Digital/DVI): Accepts high-definition digital sources via a DVI-to-HDMI adapter.
Composite video and S-video are not supported natively. Connecting older consoles that only output composite requires an external transcoder, such as a Koryuu, or specific console hardware modifications.
Step-by-Step Setup Guide
Getting a pristine image requires physical connections followed by targeted menu calibrations. Follow these steps to configure your hardware.
- Power Connection: Plug a 5V, 1A (or 2.5A for Pro models) power supply with a positive tip into the DC jack.
- Display Output: Connect a DVI-to-HDMI cable or standard HDMI cable from the OSSC video output port to an open HDMI port on your TV or monitor.
- Console Hookup: Attach your console using high-quality shielded cables—such as RGB SCART or component cables—to the corresponding input on the OSSC.
- Power On: Turn on the OSSC, press the menu button on the remote, and navigate to Input Select. Choose the correct profile matching your cable type (e.g., AV1: RGBS for SCART).
- Power Console: Turn on your classic console. The on-screen display will show the incoming resolution and refresh rate.
Optimizing Video Modes and Line Multiplication
Once you have a stable picture, you can adjust the scaling parameters to fit your display. Most modern televisions handle 5x scaling for 240p signals, resulting in a clean 1200p or padded 1080p output.
- Line 2x / Line 3x: Best for lower-resolution displays or when testing compatibility.
- Line 4x / Line 5x: Delivers sharp high-definition output for 240p content, making individual pixels pop without blurring.
- Optimization Settings: Adjust the H.samplerate and sampling phase if you notice vertical striping or shimmering colors on static backgrounds.
For deep dives into specific console timings, consult the Classic Console Upscaler Wiki for community-tested profiles.
Common Mistakes to Avoid
New users often run into a few predictable pitfalls when configuring their hardware for the first time.
- Using Cheap Unshielded Cables: Cheap SCART cables lack individual wire shielding, which causes severe jailbar artifacting and audio buzz. Invest in quality cables from trusted suppliers like Retro Gaming Accessories.
- Ignoring TV Game Mode: Modern televisions process images through internal filters that add latency. Always enable Game Mode or PC Mode on your TV to let the OSSC handle scaling cleanly.
- Expectation of Plug-and-Play Composite: Plugging a standard yellow composite cable into an adapter without a transcoder yields a black screen or rolling static. Verify your console's native output before ordering.
Frequently Asked Questions
Does the OSSC work with PAL consoles?
Yes, the OSSC supports both NTSC (240p/480i) and PAL (288p/576i) signals. However, your modern television must support the specific refresh rates of PAL software, which run slightly slower than NTSC equivalents.
Why do I get a "No Signal" blue screen?
This usually happens when the input source isn't sending proper sync pulses, or the OSSC is set to the wrong input channel. Check your cable seating and verify that the input selection matches your physical connection.
Can I use wireless controllers with an OSSC setup?
Yes. Because the OSSC adds zero processing lag, any delay you experience will come solely from your display or wireless controllers. Modern 2.4GHz wireless retro controllers work seamlessly without compounding latency issues.
How does it compare to software emulation?
Software emulation relies on a host computer to render games inside an emulator package. The OSSC lets you use original hardware cartridges and discs on modern flat screens while preserving the authentic analog signal chain.
