> > I'm working on my daughters 486DX, and I'd like some assistance from you
...
> I see that most of your questions have already been answered.
...
>  I have seen 16MB 30-pin SIMMs
> advertised sometimes but there are no 8MB 30-pin SIMMs.  This is because of
> the requirement for installing memory in sets of four SIMMs.
>

  The standard for 30-pin SIMMs asigns A0-A10, that is 11 bits, which can turn
into 22 bits because of address multiplexing. So the limit for a 30-pin SIMM
was 4MBytes (of course, always speaking of standard components).

************************************
Javier Vizcaino. Ability Electronics. [log in to unmask]
  Starting point:        (-1)^(-1) = -1
  Applying logarithms: (-1)*ln(-1) = ln(-1)
  Since ln(-1) <> 0, dividing:  -1 = 1     (ln(-1) is complex, but exists)