240p Test Suite adds Monoscope pattern for CRT calibration checks

For anyone running emulators, CRTs, scalers, or real retro hardware, the latest 240p Test Suite update lands with immediate setup value. The big addition is a new Monoscope test pattern developed by Keith Raney, a tool that gives CRT owners a clearer way to judge whether a display is aligned, focused, and behaving the way it should.

That matters because 240p Test Suite has never been just a nostalgia piece. The homebrew suite is built to evaluate upscalers, upscan converters, line doublers, and TV processing of 240p video, while also helping calibrate CRTs and classic console signals. Junker HQ calls the Monoscope Pattern “the traditional tool for calibrating CRTs” and says this version is meant to help users make informed decisions about convergence and deflection. In practice, that makes it useful for anyone trying to tune a PVM, BVM, arcade monitor, or a consumer set that still shows up in a clean retro setup.

The new pattern expands a toolkit that already reaches deep into the hardware side of the scene. The GitHub repository describes 240p Test Suite as a homebrew software suite for evaluating display chains, and the project is also used to test FPGA implementations and emulators. The Wii and Dreamcast versions include modes for 480i and 480p evaluation, which gives the suite even broader value beyond standard-definition 240p checks.

The update also points to how active the project remains. RetroRGB reported that a major revision was available for most versions of the suite, and that an early Nintendo 64 build had already been tested with several new features in place. A later Retro Tech Patreon post framed the segment around “the new 240P Test Suite for the N64” and identified Keith Raney as a CRT calibration specialist who has contributed heavily to the project. That N64 preview matters because the console has long been one of the trickier systems for video testing, and a stronger test build there could make setup work easier before the version is fully released.

This is also the latest sign that 240p Test Suite keeps moving forward rather than sitting still. RetroRGB previously noted that Wii and GameCube versions gained Disappearing Logo, Phase Check, and Video Sample Rate tests in August 2024, and the GitHub project has continued to see updates and recent commits into 2026. Free to download, open source, and still being refined, it remains one of the scene’s most practical tools for anyone chasing a cleaner picture from original hardware or accurate emulation on a CRT.