this inexpensive vga video splitter. You run a vga cable from the computer to the box, a second one to the monitor and a third to the projector.
Another simple fix would be an inexpensive second video card or replacement card which could have multiple ports. The type of card would depend on the bus slot you might have available on the older computer.
I have one computer in my classroom, an older PC. I have a fairly new projector.
To make the PC project I have to run a 30 foot cable across the room to the projector. This is awkward, but not the problem.
The PC only has one VGA plug and isn't set up for 2 monitors. To use the projector, I lose the monitor. Using the mouse on a projection 30 feet away is problematic.
I have USB ports and a serial port to spare on the computer tower.
I need the least expensive solution. Is there such a thing as a splitter I could attach to the tower? What about VGA to USB cords?
If you can lend some advice, you will have contributed to the education of 100 kids and you'll make one teacher a lot less awkward with basic tech. Thanks in advance!