@labview1958 wrote:
Do all PC's have a parallel port? Can a parallel port be added to a PC? Can a serial port in a PC be modified to a parallel port?
Szandard IBM-compatible PC do have a parallel port. But is became obsolete in recent years. A parallel port was usually be used to connect a printer - it ís also known as printer port. With modern printers being connected by other means this port is often no longer availabel.
There are several ways to add a parallel port, if non is availabel. Either buy a parallel card and install it. Or buy a USB/parallel-adapter (for example here: http://www.keyspan.com/products/usb/up6c/). And finally there are some Ethernet/parallel adapters or print servers, but these may be overload.
No, serial and parallel ports are functional totally different, they cannot be modified to each other.
Greetings from Germany!
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Uwe