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8255/8253 I/O


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The 8255 I/O card is a programmable peripheral interface for PC/XT, PC/AT, 80386, 80486 or compatible. The interface card contains 8253 chip and 8255 chips, the 8253 chip provides programmable interval timer/counter function, and the 8255
chips provide programmable input/output functions.




  • Programmable l/O control functions.
  • Up to 48 I/O lines.
  • Maximum of 2 MHz count rate.
  • Three independent 16 bits counter.
  • Support several operating modes which are programmable.
  • Sixteen LEDs indicate when l/O is operating.
  • Port address selectable.