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 fileformat, standard 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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