[Àû¿ë´ë»ó: DOSBox-x]

I/O delay in nanoseconds for I/O port access. Set to -1 to use default, 0 to disable.

A value of 1000 (1us) is recommended for ISA bus type delays.

If your game or demo is not sensitive to I/O port and ISA bus timing, you can turn this option off
(set to 0) to increase game performance.
