Re: DMA 4 meg v. 8 meg

[Linards Ticmanis <ticmanis@gmx.de>]

On 05/05/2011 01:52 PM, KP wrote:

> 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?

Of course I can't give any guarantees, but I wouldn't think so. Most Z80
cards (in fact all that I know of) access only the motherboard RAM and
maybe the //e compatible Aux RAM, which on the IIgs is also on the
motherboard; remember CP/M is at heart an OS for machines up to 64KB, it
can't make any really good use of anything much beyond that, except
maybe as a RAM disk.

Physical destruction of anything by a DMA failure is pretty unlikely
IMHO. In the worst case it'll fail with flying colors (i.e. the failure
will be totally obvious, such as failure to start up, or failure to boot
CP/M), but most probably it'll just work.

-- 
Linards Ticmanis