How to chose between iIntel P8255A variations

[gkmaia]

Hi, i got a piece of gear that needs a new Intel P8255A.

The intel datasheet is very vague when it comes to the variations.

Most what I find for sale describe P8255A, P8255A-2, P8255A-5 as all the same. I imagine the difference between them may be max frequency?

Not sure if that is of any help but my CPU is running at 6Mhz.

[greenpossum]

If you look at the datasheet from the Internet that describes the 8255A and 8255A-5 there are minor differences in the requirements for signals. I haven't found a datasheet describing the 8255A-2 yet.

[coromonadalix]

you have the high performance cmos version  82c55a ??  it's pin compatible with the 8255