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README.md

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Follow these rules, or bad things will happen!

  • Don't mix ROMs for different platforms - use generic BASIC with generic KERNAL, Ultimate64 BASIC with Ultimate64 KERNAL, etc.

  • Don't mix these ROMs with any other ROMs; exceptions:

    • kernal_hybrid*.rom, which is meant to be used (and has to be used) with the original BASIC ROM; however, these hybrid ROMs cannot be distributed due to legal/copyright reasons; see here for instruction how to create them

    • chargen_*.rom - these ones are fully interchangeable

  • Don't mix ROMs from different builds/versions (again, CHARGEN is an exception).

  • The generic ROM set should be compatible with any C64-compatible machine; platform-specific ROMs might not work on other platforms.


For Ultimate 64 motherboard the following settings are recommended:

  • U64 Specific Settings -> Turbo Control -> U64 Turbo Registers

The *_crt ROM set is a special version, with some code moved to external ROM on the cartridge - thus, more features could be enabled. It needs all the 3 files (BASIC, Kernal, cartridge) to be operable.


Have fun!



PXL font was created by Retrofan, we got a permission to include it with Open ROMs under GNU Lesser General Public License 3.0, see here.