The C64 dead test font

12 · Adafruit Industries Blog · May 27, 2026, 4:49 p.m.
computers Software Test Equipment Vintage Computing C64 easter-egg commodore Dead Test cartridge
Summary
Norbert Landsteiner explores the unique font of the C64's 'Dead Test' diagnostic cartridge, detailing its implementation and uncovering an Easter egg. He also provides downloadable Commodore 8-bit character ROMs related to the font.
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