Parallel port's hardware modes, comma-separated, meaning:

• PCSPP - PC-style SPP registers are available.
• TRISTATE - Port is bidirectional.
• COMPAT - Hardware acceleration for printers is available and will be used.
• EPP - Hardware acceleration for EPP protocol is available and will be used.
• ECP - Hardware acceleration for ECP protocol is available and will be used.
• DMA - DMA is available and will be used.

Note that the current implementation will only take advantage of COMPAT and ECP modes if it has an IRQ line to use.