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millfork/docs/lang/preprocessor_cbm.md
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Preprocessor options for Commodore computer targets

All Commodore targets define the CBM feature as 1.

Target detection

  • CBM_PET – 1 if the target is PET, 0 otherwise

  • CBM_VIC – 1 if the target is VIC-20, 0 otherwise

  • CBM_264 – 1 if the target is an 8-bit Commodore computer from the 264 line, 0 otherwise

  • MOS_6510 – 1 if the target uses a MOS 6510-compatible processor (with an I/O port at $0000/$0001)

  • CBM_64 – 1 if the target is Commodore 64, 0 otherwise

  • CBM_64_CRT – 1 if the target is a cartridge for Commodore 64, 0 otherwise

  • LUNIX – 1 if the target is Commodore 64 running LUnix, 0 otherwise

  • CBM_128 – 1 if the target is Commodore 128, 0 otherwise

  • CBM_64_COMPAT – 1 if the target is an 8-bit Commodore computer compatible with Commodore 64 (for example, C128, C65, Mega 65), but not Commodore 64 itself, 0 otherwise

Feature enabling

Due to incompatibilities between different versions of Commodore PET, certain libraries can be configured to support only some ROM revisions. By default, all of these are enabled:

  • PET2000_SUPPORT – set this to 1 to enable support for PET 2001 with the original ROMs (BASIC 1.0), set it to 0 to disable it

  • PET3000_SUPPORT – set this to 1 to enable support for PET 3000 series with the upgraded ROMs (BASIC 2.0), set it to 0 to disable it

  • PET4000_SUPPORT – set this to 1 to enable support for PET 4000 with the 4.0 ROMs (BASIC 4.0), set it to 0 to disable it