I/O refers to Input/Output, which is the transfer of data between the CPU and a peripheral device. I/O modules, which can be digital and analog, are self-contained components that interact between the CPU and peripherals.
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HP HDMI Port Flex IO (705)
3TK75AA
£23.99
HP Desktop Mini I/O Module
K9Q84AA
£76.99
£140.99
£193.99
DELL NGHD0 digital/analogue I/O module
DELL-NGHD0
£273.99
£326.99
£341.99
£655.99
£1,378.99