This is a 8255 IO ISA port card. The ISA slot is not standard for now PC machine. This type 8255 card that I made it when studying in technical college 20 years ago. The project is interesting. I was found the book about 8255 card making for APPLE computer. The slot is different between Apple and IBM, so I studied hardly for slot interface, address decoding and so on. At the end, I got the higher mark because it is work normally. That card was toke by teacher. The address decoding circuit was using the "Big" logic AND gate IC for 8 bit address bus. Mean of "Big" is more input pin ^_^  

This type 8255 card also can drive my LED display board. The program is DOS Basic.