properties

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

description

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