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Just brought a 1986 Kaypro CRT back to life with a Teensy 4.1!
Driving vintage green phosphor CRTs with modern microcontrollers:
- Hardware timer-based sync (18.432 kHz / 50 Hz)
- 10 test patterns for convergence
- 8×8 bitmap font engine (text rendering in progress)
- All open source & non-commercial
Built with @AnthropicAI Claude in one afternoon 🤖
Photos show horizontal crosshair alignment & test bars
Next up: SN74LS245N level shifter arrives tomorrow for pixel-perfect text!
Repo 👇


Trent Von Holten@308Greenfield
Picked up a KAYPRO monochrome monitor. Nice donation. Might try to get it working with an arduino. I don’t have any original hardware. Came with a Tandy base
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