GeckOS – The Unix-like operating system


GeckOS is a Unix-like multitasking operating system for computers with MOS Technology 6502 processors.

GeckOS was already developed in 1989 for a clone of the Commodore PET with additional MMU. It was later ported to the C64. The developer included a software library “lib6502” that provided compatibility between GeckOS and LUnix. GeckOS was also open source.

It is preemptive and implements some Unix-like features, like signals, semaphores, relocatable fileformatstandard library, internet support via a kind of simplified sockets and last but not least virtual consoles.

After releasing version 2.0.0 it has a lot of new features:

  • multithreading
  • dynamic memory management
  • relocatable fileformat
  • lib6502 standard library
  • internet support



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