[TUHS] Split addressing (I/D) space (inspired by the death of the python... thread)

[Dave Horsfall]

On Thu, 3 Aug 2023, Clem Cole wrote:

> For whatever its worth, even with 4M the kernel had started to become a 
> problem for V7 on an 11/70.  Data buffers eat a lot of memory.

We at UNSW had a kludge for that; the global symbol "b" (similar to "u") 
was mapped by KISA5 into the current buffer header.  Having dozens of 
buffers on a 40-class machine was really something...

-- Dave