This 8KB ROM contains Commodore BASIC v2.0. Interestingly, this chip is generally identical across both North American (NTSC) and European (PAL) models.
This 4KB chip stores the visual representation of the PETSCII character set. PAL vs. NTSC Differences Download [BIOS] Commodore VIC-20 (Europe)
These BIOS files are copyrighted material originally owned by Commodore Business Machines. While widely available on community archives like Zimmers.net or C64-Wiki , they are technically "abandonware." This 8KB ROM contains Commodore BASIC v2
The system clock and interrupt timers are calibrated for a 50Hz refresh rate, compared to the 60Hz rate used in North America. Implementation and Emulation Download [BIOS] Commodore VIC-20 (Europe)