SCM port expansion process, and to include serial and serial to parallel programs such as the expansion process. Informative, see the next!

第一章
......\1.3
......\...\IO驱动74LS164
......\...\.............\IO驱动74LS164.txt
......\...\IO驱动74LS165
......\...\.............\IO驱动74LS165.txt
......\...\串口驱动74LS164
......\...\...............\串口驱动74LS164.txt
......\...\串口驱动74LS165
......\...\...............\串口驱动74LS165.c
......\1.4
......\...\8155驱动程序
......\...\............\config.h
......\...\............\driber8155.Uv2
......\...\............\drive8155.c
......\...\8255驱动程序
......\...\............\config.h
......\...\............\drive8255.c
......\...\............\drive8255.Uv2
......\...\用8243扩展IO接口
......\...\................\config.h
......\...\................\drive8243.c
......\...\................\drive8243.Uv2

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