I have gone through data sheets of both, couldn't find which is the max data rate at which the 82C55 and DIO 96 can be operated. I need more materials on these chips. I am sure somebody can help me with this.
I have some more doubts over the DIO-96 from NI. They say it uses four 8255 chips. But I dont see as many pins, I only see 24 I/O pins for each block of 8255 but what heppened to other control pins? Isn't there any control bits in NI DIO 96?
I had a look at NI site. DIO 96 seems to be a bord using four 8255. You only have access to the IO connector which is wirred to the IO pins of the four 8255. Control pins of the four 8255 are driven by a logic interface between the host PC (ISA or PCI bus) where the DIO 96 is plugged into.