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8255-8254 I/O LAB


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The 8255/8254 laboratory adapter is a programmable interface for PC/XT, PC/AT, PC/ 386, PC/486, Pentium or compatible computers. The interface adapter contains 8254 chip and 8255 chips, the 8254 chip provides programmable interval
timer/counter functions and the 8255 chips provide programmable input/output functions. There are two type of cards, one contains many plated through-holes at the adapter for laboratory development and another is typical 8255/8254 adapter.




  • Programmable I/O control functions.
  • Up to 48 I/O lines.
  • Maximum of 10MHZ count rate.
  • Three independent 16 bits counter.
  • Support several operating modes which are programmable.
  • Port address selectable.
  • Optional-plated through-holes for laboratory development.
  • Delay wait state selectable.