Colleagues to write a kernel, Preemptive scheduling, support for a simple signal and mutex. Very small, according to the needs of the code in the 0.5k-1k.

戈卫东写的内核
..............\k51.h
..............\k51a12.asm
..............\k51a123.asm
..............\k51a1234.asm
..............\k51start.asm
..............\k51v1.Uv2
..............\k51_a.asm
..............\k51_cfg.inc
..............\k51说明.txt
..............\sample_a.asm
..............\sample_c.c

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