This an oscilloscope program written in c using the XForms library. It uses the PC s parallel port for data input. The way it s done is as follows: first data bit 1 is set to 1 then to 0 to enable the a-to-d converter ( ADC0801 ), then we read 4 bits of data from the multiplexer ( 74LS157 ) placed after the a-to-d, then a 1 is sent to the second data bit and the other four bits of data are read. The circuit is setup as follows: ---------------------------------------------------------<---- Data bit 1 | | ---------------- -------------- | | D0|-------->----------| Select|----<---- Data bit 2 |---|Enable D1|-------->----------| | From | D2|-------->----------| O0|---->---- Status bit 4 Circuit->--|Ain D3|-------->----------| O1|---->---- Status bit 5 | D4|

117143191oscope-1.5.tar

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