一个非常经典的街机玛丽机程序，里面包含很多IO扩展IC的驱动程序和很多加减乘除运算程序，非常值得一看-A very classic arcade Mary program, which contains a lot of IO extension IC drivers and a lot of arithmetic operation program, well worth a look

A Graphics for 3 dimensional IC view in c programming, can be run in turboc editor(ANSI C)