This a small operating system based on 51, or a real-time kernel, I feel is well written.

SCH51 OS V1.45
..............\debug
..............\.....\Main.obj
..............\.....\Sch51.obj
..............\.....\SCH51_App
..............\.....\SCH51_App.hex
..............\.....\SCH51_App.lnp
..............\.....\SCH51_App.plg
..............\.....\T0_init.__i
..............\.....\T0_UART_INIT.obj
..............\.....\task.obj
..............\pdf
..............\...\CONFIG.h.pdf
..............\...\INCLUDES.h.pdf
..............\...\Main.c.pdf
..............\...\Sch51.c.pdf
..............\...\Sch51.h.pdf
..............\...\T0_UART_INIT.c.pdf
..............\...\T0_UART_INIT.h.pdf
..............\...\task.c.pdf
..............\...\TASK.h.pdf
..............\picture
..............\.......\Pulse_Keil_V1.45.jpg
..............\.......\Thumbs.db
..............\SCH51
..............\SCH51 OS V1.45.pdf
..............\.....\config.h
..............\.....\includes.h
..............\.....\Sch51.c
..............\.....\Sch51.h
..............\.....\T0_UART_INIT.C
..............\.....\T0_UART_INIT.h
..............\task
..............\....\task.c
..............\....\task.h
..............\user
..............\....\Main.c
..............\....\Main.LST
..............\....\Sch51.lst
..............\....\SCH51_App.m51
..............\....\SCH51_App.uvgui.Administrator
..............\....\SCH51_App.uvgui.YI
..............\....\SCH51_App.uvopt
..............\....\SCH51_App.uvproj
..............\....\SCH51_App_uvopt.bak
..............\....\SCH51_App_uvproj.bak
..............\....\T0_init.lst
..............\....\T0_UART_INIT.lst
..............\....\task.lst

• We are an exchange download platform that only provides communication channels. The downloaded content comes from the internet. Except for download issues, please Google on your own.
• The downloaded content is provided for members to upload. If it unintentionally infringes on your copyright, please contact us.
• Please use Winrar for decompression tools
• If download fail, Try it againg or Feedback to us.
• If downloaded content did not match the introduction, Feedback to us，Confirm and will be refund.
• Before downloading, you can inquire through the uploaded person information

Nothing．