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With the motherboard print port working mode description: Parallel port mode: includes: SPP, EPP, ECP, ECP+EPP The Normal SPP (Standard Parallel Port) mode is compatible with all parallel devices and is the slowest. recommend ECP(Extended Capabilities Port) Data is sent using the DMA protocol and provides symmetric two-way communication at a rate of 2.5 Mbit/s. With the help of FIFO (First Input First Output), ECP is very beneficial for large data devices such as scanners and printers. EPP(Enhanced Parallel Port) Asymmetric two-way communication is provided using the existing parallel port, which is more suitable for parallel port drivers. The BIOS also supports ECP+EPP mode. If you don't have one of the devices, you will waste an IRQ.