🕹️ Atari Character ROM for Commodore 64 — MOS 901225-01 Replacement
Transform the look of your Commodore 64 with this Atari-style Character ROM replacement. Designed for the original MOS 901225-01 character ROM socket, this module replaces the default tall, blocky Commodore font with a smaller, cleaner Atari-inspired typeface for sharper, more refined text output.
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⚙️ Installation
This is a direct drop-in replacement for your existing character ROM.
No soldering required — just remove your old ROM and plug this board in.
• On most 250407 boards, it’s the rightmost ROM chip, located between the KERNAL ROM (to its left) and the 6510 CPU (to its right).
• Works with all classic C64 “breadbin” motherboards (250407, 250425, 250466).
• Compatibility with C64C may vary, as some later boards combine multiple ROMs into one package.
If your board has a separate character ROM, this mod will fit perfectly.
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💡 Features
• Plug-and-play replacement for MOS 901225-01
• Atari-style character set for a crisp, modernized display
• No modifications or tools required
• 100% compatible with all C64 BASIC and KERNAL functions
• Ideal for restorations, mods, and retro enthusiasts
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📺 Compatibility
• Commodore 64, C64 Breadbin, 250407, 250425, 250466
• VIC-II video chip: 6567 (NTSC) and 6569 (PAL)
• Fully compatible with C64C short board.
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🧠 Why This Mod
The stock Commodore character set is large and chunky — this ROM delivers a cleaner, sleeker Atari-inspired font that looks fantastic on CRT displays. It’s subtle yet immediately noticeable, giving your C64 a unique personality without changing its classic feel.
