Re: DMA 4 meg v. 8 meg

[KP <kjpmail@gmail.com>]

On May 5, 12:56 am, Michael Black <et...@ncf.ca> wrote:
> On Wed, 4 May 2011, KP wrote:
> > I have a 4 meg RAM card in the memory slot of my ROM 03 IIgs.  I have
> > often heard that only the first 4 megs of expansion-card RAM is DMA-
> > compatible.  Can somebody explain what DMA actually is?
>
> > Does this mean that AppleWorks v5.1 will only recognize 5 megs (1 meg
> > motherboard RAM + 4 meg expansion card RAM) even if I put an 8 meg
> > expansion RAM card in the memory card slot?
>
> > Does this mean that the second 4 meg of expansion card RAM is useful
> > only as a RAM disk, and not as memory for programs to access, in order
> > to store long documents that the user is editing, graphics being
> > opened from disk, sounds being edited, HyperStudio stacks, etc.?
>
> I see the specific question wasn't answered.
>
> It won't mean a thing for your purposes.
>
> Unless you have something that takes control of the Apple bus in order to
> directly control the RAM, lack of DMA won't matter to you.
>
>    Michael

Thank you!

I have an AE Z80+ card installed, and it works fine at the moment
(with 1 meg motherboard RAM and 4 meg expansion card RAM).  Should I
be at all concerned about what would/could happen (such as, could it
destroy the Z80+ card or cause it to not function?) if I installed an
8 meg expansion RAM card?