From: ard at p850ug1.demon.co.uk
 
 ---snip---
 However, I make those modifications as reversable
as possible (I would
rather not cut a PCB track, but sometimes there is no other way, for
example). And I don't make them if I don't have to (which is what this
darn thread started off about).
-tony
 
 Hi
  I guess I'm like you. I have a Olivetti M20 and wanted
 to get the CPM-8000 running on it. The original memory
 cards had 16K DRAMs that gave the system 224K. To run
 CPM-8000 I needed to have 64K DRAMs. It required that I
 unsolder the DRAMs, some capacitors and cut a power line
 to configure for the larger DRAMs. 
 
Sounds like a very reasonable and useful mod to do. This is _certainly_
the sort of thing I would do to a classic computer and not worry about
it. Yes, history is lost, but the benefits (here, being able to run
CP/M-8000) outwiegh that IMHO.
Talking of removing decoupling caps when changing from 16K to 64K DRAMs,
one day I myse repeat the story of how an Epson QX10 graphics board led
me a merry dance because the previous owner had done the 32K-128K
upgrade, he'd replaced the chips, moved the links, and then had a machine
that behaved very oddly...
   While I would have prefered to get the larger memory
 boards from the manufacture, this was not all that practical.
 I felt that getting working images of the CPM-8000 was
 more important.
  A computer that doesn't work is an interesting pile of
 hazardous waste. One that works is a window into what was. 
No diagreement there!
-tony