May 14, 2026

Old screen, huge main character energy

60fps Video on a CGA? – The GlyphBlaster

A tiny modern chip just turned an ancient PC screen into a video show-off, and the comments loved it

TLDR: A hacker used a tiny modern chip to make an old IBM CGA display show fast monochrome video by cleverly replacing its character font chip. Commenters were split between calling it glorious cheating and an absurdly lovable stunt, which is exactly why the project blew up.

Retro computer fans have officially entered their "because we can" era, and the crowd is absolutely eating it up. The project behind GlyphBlaster takes an old IBM CGA graphics card — the kind of painfully limited 1980s display tech most people would assume belongs in a museum — and sneaks in a tiny modern helper chip to make it show fast-moving black-and-white video. In plain English: someone found a wild way to make a famously basic old screen do a flashy new trick, without heavily modifying the original hardware. That alone was enough to send commenters into delighted disbelief.

The biggest mood in the replies? Half respect, half playful accusations of cheating. One commenter basically said this feels like the retro-hacking version of a magic trick: yes, it’s technically bending the rules, but it’s still too audacious not to applaud. Another summed it up as using a modern processor to turn old hardware into “a crappy monitor,” which sounds rude until you realize it’s affectionate nerd humor. The jokes kept coming, from dreams of stuffing this idea into other old game systems to one mock-outraged Amiga fan crying “cultural appropriation” while still praising the hack.

There wasn’t much true fighting, but there was delicious geek drama: is this a clever tribute to old hardware, or a hilarious example of brute-forcing vintage limits with absurd modern power? The community verdict seems clear: both, and that’s exactly why they love it. There were even calls to push the trick further with color hacks and comparisons to legendary retro stunts like 8088 MPH. In other words, the comments didn’t just approve — they immediately demanded a sequel.

Key Points

  • The article describes GlyphBlaster, a Pico 2-based replacement for the IBM CGA font ROM that repurposes font ROM reads as a 1bpp framebuffer.
  • The design relies on the CGA card's continuous text-mode font ROM reads and uses the ROM socket's /CE pin plus an external VSYNC signal for synchronization.
  • The author kept the CGA card otherwise unmodified by attaching a test clip to the VSYNC pin on the DE9 connector.
  • The prototype uses PIO programs and DMA-fed FIFO buffering to output image data, with a stated goal of wirelessly streaming 1bpp video using the Pico 2 W's Wi‑Fi.
  • A first prototype reused an 8087-socket PCB, connected the 8 data lines, /CE, and VSYNC, and successfully displayed a 912x262 Mandelbrot bitmap on screen.

Hottest takes

"The sky's the limit" — LocalH
"I am deeply offended by the cultural appropriation" — snozolli
"Using the CGA as a crappy monitor" — djmips
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