🚀 go-pugleaf

I am trying to get my 520 upgraded.  I am not too familiar with the innards
of my machine, and after talking with some dealers I am even more confused.
 
1)  Can the ease of upgrading the memory be dependent on which version of
    TOS I am running, or are these entirely separate issues?
 
2)  One dealer says it will take three weeks, another says it takes an
    hour (and his cost is better too.)  However, after 6 weeks the chips
    are not in yet.  Other dealers confirm that the chips are hard to
    get.  There is no dealer in the S.F. Bay Area that can do the work
    *now*, mainly because the chips are not available.  Is this normal?
 
3)  One dealer said that in  January there will be a board that will
    accept plug-in memory chips.  Is this really true?  Will it really
    be in January (1990)?
 
4)  Where can I get the chips, assuming I will have to get them myself,
    and dealers don't have them?
 
5)  What sorts of things can go wrong during this procedure, and how can
    I test it afterwards?  (I assume by reading & writing to the highest
    memory location???)  I am conversant in assembler if the answer to
    this requires such.
 
 
Guy Ridley