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Currently Playing: Why Many VGA→HDMI Adapters Don't work with Retro Computers

Here’s a ready-to-paste description tuned for search: Wondering why your **VGA→HDMI adapter** shows **“No Signal”** when a retro PC boots into **DOS 80×25 text mode**? In this video I test multiple adapters and explain why many scalers refuse **720×400 @ \~70 Hz**—the classic DOS text resolution. I also show a few video cards that switch text mode to **640×480** (rarer, but it works on more HDMI gear), and compare how CRTs, LCDs, and capture cards handle these signals. What you’ll learn: * **720×400 vs 640×480**: timings, refresh rates, and why scalers get confused * Why many **VGA→HDMI converters** don’t accept **DOS text mode** (handshake/processing limits) * Real-world tests: adapters that pass, fail, or stretch/blur the image * Practical **workarounds**: forcing 640×480 text (when possible), using proper upscalers, or sticking with a CRT/VGA capture If you’re troubleshooting **retro PCs, IBM-compatible/MS-DOS, VGA, SVGA**, or trying to stream/capture BIOS and DOS output, this breakdown will save you time (and returns). Chapters in the video: overview → timing explainer → adapter shootout → results & fixes. — VGA to HDMI adapter/converter, DOS text mode, 720×400, 80×25, 640×480, 70 Hz, retro PC, CRT, capture card, scaler, EDID/timings, BIOS screen. #DOS #RetroPC If this helped, tap 👍 and subscribe for more NostalgiaPC deep dives!