OTOH, you have those 805x types in the 40-pin DIP in the inventory. You also have those 8255's from back in the '80's.
that is IMPOSSIBLE, we have NO SUCH, I do not think we have any chips more than 10 years old.

Now, how many of the 192 channels can you manage this way? Why did you even go there
Because YOU brought it up

for the task I proposed,
In your desperate attempts to defend the use of the antique, every time I refute one of your 'examples' you have brought up, who knows how many, "tasks" if you refer to one, state which one.

You must really like paying for PCB's, Erik. If you have a small number of controllers, perhaps as many as 3, you wouldn't build a new PCB, would you?
I have to, to get the right connectors, Of course, were I to provide a cats cradle, that would not be necessary, but provideing a cats cradle would be 10000 times more likely to cost me my job than a reasonable refusal to use an 8255 (as you suggest).

Let me point something out, however. You say you want to use a controller that you've never used before. That requires a PCB, since you're using SMT parts, right? You have to have the finished prototype hardware on the boss' desk today. How're you going to manage that? Of course, you could use that "standard" 805x board that's already on the shelf. The one with the big prototype area.
Are you trying to imply that I have never used a '51 before?

How're you going to justify using a new device when what you've already got on the shelf will do the job?
you keep coming back to that totally irrelevant and incorrect statement I DO NOT "use a new device" when one in use will do. That is simple economics, the more you buy of a given part, the cheaper they are. So, if a part

That's 192 stretched cycles every 168 hours
I do not know where you get 168 hours from.

Of course, if you toggle something only once every 196 hours, the effect of yoing steam, instead of electronics, becomes neglible.

So, yes, if it was your ultimate desire to use an 8255 (besides 'desire' I can see no reason) you could use an 8255 for driving an occasion that rare,

Erik

PS I gave a concrete example of 2 I/O operations in 70ns (a simplified version of what I do) but since that show how unwieldy the 8255 is, you do, of course, not even refer to it.