Electronics
IPhone 4 Screen Replacement Checklist.
Replacing anything else on the IPhone 4 is probably easier than replacing the screen, thats because unlinke the IPhone 3 you have to take just about everything out to get to the screen on this model. You Tube videos will generally give you a good idea of how to pull it all apart, but theres about 26 screws and a multitude of parts you have to deal with. Its a good idea to use a checklist as you go to guide you through the process. I like to sticky tape the screws next to each task as I run down the checklist, then I run through the checklist in reverse to put everything back in the right order.
Please feel free to use my checklist as a guide to making your own checklist 
download here -> iphone4 checklist
Internet Kiosk Software & Parallel Port Interface
This Visual Basic Project replaces the explorer.exe file on a windows machine to turn it into an internet kiosk. The parallel port is scanned for signal, on collecting a signal the application adds time to the browser. When the time runs out the session expires and a store advertisment appears. Hooking a coin reader into the parallel port was a bit too buggy, sometimes the system wouldnt read the coin drop, so we implemented a ticket system. › Continue reading
Detect Signal On Serial Port VB6
MSComm1.CommPort = 1 ‘use serial port 1
MSComm1.PortOpen = True ‘open it up
If MSComm1.CommEvent = comEvCTS Then ‘comEvCTS = change in the CTS pin
lblResults.Caption = “signal received”
End If
MSComm1.PortOpen = False