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proteus vsm
you can open sample, try 8051 sample, then right click uC, select properties,u will see program file text box(this is place u can put hex file of your program).
so start make your own uC system, then put hex file.
uln2003 comport
connect to VCC after diode katode first.
Added after 12 minutes:
sorry, I mean here :
-COM pin---to--->Anode of Diode
-catode of same diode ---to--->VCC
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