Hello Matt,

  M> Armed only with the DOS attitude, "If it fails the
   > first time, try running it again, it might work this
   > time"...

I love it when persistance pays off! :-)

  M> Currently, I have 64MB installed as 4x 16MB SIMMs in
   > slots 1, 3, 6 & 8. If I wanted to add more memory, what
   > are my options?

I'm not fortunate enough to have a VAX 4000, so I would have
to check the documentation.  Generally speaking on a 32-bit
machine, a bank is four byte-wide (30 pin, 8 or 9 bit) SIMMs
or a single word-wide (72 pin, 32 or 36 bit) one. That said,
there are an awful lot of variables when it comes to the
structure and timing of memory, and there's always the
designer wildcard (if they used page interleaving for
example, you might need a pair of word-wide SIMMs).
Hopefully someone here is more familiar with your machine,
and can provide a more useful answer.

  M> Anyway, I can start playing now, and the machine
   > certainly feels quite nippy for its age.

Having 64Mb of RAM probably helps :-)

Regards,
  - Andy Ball.