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8255 is a programmable peripheral device, a chip used to control peripheral devices connected to/with in a computer in the 8086 based machines. It's a general purpose i/o controller, produced by Intel. More details: http://www.electronics.dit.ie/staff/tscarff/8255PPI/8255.htm http://www.wantronix.de/pdf/decision/8255pci.pdf

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