Originally Posted by
esa-aardvark 
286, where would you purchase those nowadays ?
Originally Posted by
radiosutch
Now you've done it, the price will jump due to Prune interest and Boeing will take a further earnings hit
There are vendors that specialize in supporting old ICs, they sometimes even buy the mask sets from the original vendor.
Needles to say the price is a 'bit' higher than the original but worth it compared to a full redesign.
Of course a 286 would also easily fit on a lot of FPGAs these day but cant imagine that would be any easier to certify than a clean sheet design,