|Panasonic never made Vista drivers for your model.|
Windows Vista Compliance
Monochrome Laser Printer
(model) Vista 32 bit / 64 bit
KX-P6500 No plan No plan
However, there are drivers for a very similar model built into Vista.......
"Did you try installing it by using the "Add printer" method? Vista may have the drivers built in."
Parallel connected printers are not Plug-n-Play detectable by Windows.
If you go to Control Panel - Classic view - Printers, RIGHT click on a blank part of the resulting screen, you can choose Add a printer
Panasonic KX-P6100 is not there in Vista but KX-P6500 is, a very similar model - try that
The printer port you have the parallel connected printer connected to must be set to EPP. ECP, or EPP/ ECP mode in order for Windows to be able to detect the printer once you manually select it.
If the printer port is built into the mboard, that setting is in the mboard's bios Setup.
If you use a PCI parallel port card, it's already set to EPP, or ECP, oe EPP / ECP mode.
However, this relatively old printer model probably requires that you use a standard legacy I/O address for the parallel port
You will probably need to use a PCI parallel port card that allows you to force using a legacy I/O address, such as this one:
1 Port PCI Parallel Adapter Card with Re-mappable Address
It has a DIP switch you can set to force it to use a legacy I/O address. See the manual there.
You will probably NOT be able to get this printer to work with a PCI-E parallel port card, or a USB to parallel port adapter, unless you can force it to use a legacy I/O address.