Jonathan NAYLOR wrote in a message to Mike Bilow:

 JN> I wouldn't say freaky coding, just very heavy wizardry. Being a 
 JN> TSR, it can't call any system services and has to do a lot of 
 JN> work by hand. The code is very heavy going and not well commented.

In that era, I wrote a lot of TSRs and device drivers, but I've never seen
anything quite like the stuff in BPQ.  Reclaiming code space as stack and so
forth are just incredibly unusual techniques.  Looking into BPQ code is like
looking into a very finely crafted Swiss watch.  I doubt that even most
assembly language programmers would be able to understand it.
 
-- Mike

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