GeckOS/A65 V2.0
OS/A65 is a full-featured Multitasking/Multithreading operating system for the 6502. 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.
Sun Sep 15 00:34:21 2019 - permalink -
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http://www.6502.org/users/andre/osa/index.html