🚀 go-pugleaf

    Date: 23 Mar 89 17:36:00 GMT
    From: mailrus!caen.engin.umich.edu!bdenh@tut.cis.ohio-state.edu  (Brian J Denheyer)

    I'm looking for a memory upgrade for my 1040ST.  I've heard of the board from 
    terrific Corp.  What I want to know is : if you by a 2.5 meg upgrade can you add
    just a 1/2 meg of memory at a time, instead of doling out the dollars for many ram
    chips or do you have to have all 1 1/2 megs on there for the thing to work ?

The ST can only address 2 banks of memory at once.  A 1040ST has 2 banks
of 512K each.  So, to upgrade to 2.5 meg throws out .5 meg on the mother
board and puts a second band of 2 meg on the expansion board.  So, you
have to go out and buy 2 meg of memory, not 1.5 meg.  I don't think it
is possible to add memory to the board in increments less than the whole
2 megs.  Similarly, if you want an upgrade to 4 meg, you throw out all
of your motherboard memory and have 2 banks of 2 meg on the expansion
board.  [The EZ RAM II board is only for a 2.5 meg upgrade, as far as I
know, but there are others that can work for 4 meg.]