I think that rather than taking a backward step to a parallel scanner, it may be better to buy a USB scanner, and a USB "Powered" hub. These can be bought for approx. £20.00 up-wards and will give you 4 extra ports.
Also if you run your AOL modem from the powered hub, you will have a more consistent connection, and using other USB devices at the same time will not affect your connection. I have my AOL through a powered hub and use several other devices at the same time, [Printer, Scanner, Camera] all without problem. Regards. j.