The interface board has 5 digital input channels and 8 output channels there are also 2 analogue inputs and 2 outputs with an 8 bit resolution available the number of inputs and outputs can be expanded further by connecting up to max 4 cards to the usb ports on your pc all communication programs are saved in a dynamic link library dll k8055ddlldll saved you can write custom made windows applications in delphi visual basic c builder or any other 32 bits windows applications that sup