ZX Spectrum +2 Grey ISS3, RGB to VGA Adaptor for 15kHz monitor screen display | eBay
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Spectrum +3 to VGA - Spectrum Computing
ZX-VGA-JOY – ZX Spectrum VGA and Joystick interface
Supratim Sanyal's Computing Blog | Wandering Digital Wastelands as a Geek: Powering up a British ZX Spectrum after 30 years in America - The PAL UHF Analog TV and 220V AC Challenge