It s a real time OS.

small_rtos1.0
.............\Pc51Emu.dll
.............\small_rtos
.............\..........\README.TXT
.............\..........\list.txt
.............\..........\manual.txt
.............\..........\license.txt
.............\..........\os
.............\..........\..\OS_CORE.C
.............\..........\..\OS.H
.............\..........\keilc51
.............\..........\.......\OS_CPU_C.C
.............\..........\.......\OS_CPU_A_task16.ASM
.............\..........\.......\OS_CPU_A.ASM
.............\..........\ex3
.............\..........\...\ext3.c
.............\..........\...\config.h
.............\..........\...\OS_CFG.H
.............\..........\...\test.Uv2
.............\..........\...\test.Opt
.............\..........\...\test.plg
.............\..........\...\display.c
.............\..........\...\display.h
.............\..........\...\README.TXT
.............\..........\...\test_Uv2.Bak
.............\..........\...\test_Opt.Bak
.............\..........\...\OS_CPU.H
.............\..........\ex2
.............\..........\...\ext2.c
.............\..........\...\config.h
.............\..........\...\OS_CFG.H
.............\..........\...\test.Uv2
.............\..........\...\test.Opt
.............\..........\...\test.plg
.............\..........\...\display.c
.............\..........\...\display.h
.............\..........\...\README.TXT
.............\..........\...\test_Uv2.Bak
.............\..........\...\test_Opt.Bak
.............\..........\...\OS_CPU.H
.............\..........\ex1
.............\..........\...\OS_CFG.H
.............\..........\...\ext1.c
.............\..........\...\config.h
.............\..........\...\test.Uv2
.............\..........\...\test.plg
.............\..........\...\test.Opt
.............\..........\...\README.TXT
.............\..........\...\test_Uv2.Bak
.............\..........\...\test_Opt.Bak
.............\..........\...\OS_CPU.H
.............\..........\ex4
.............\..........\...\OS_CFG.H
.............\..........\...\config.h
.............\..........\...\test.Uv2
.............\..........\...\test.Opt
.............\..........\...\ext4.c
.............\..........\...\test.plg
.............\..........\...\display.c
.............\..........\...\display.h
.............\..........\...\README.TXT
.............\..........\...\test_Opt.Bak
.............\..........\...\test_Uv2.Bak
.............\..........\...\OS_CPU.H
.............\readme.txt

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