Re: DMA 4 meg v. 8 meg

[Linards Ticmanis <ticmanis@gmx.de>]

On 05/05/2011 02:02 AM, D Finnigan wrote:
> 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?
> 
> DMA means Direct Memory Access and it's a way to alter the contents of
> memory without involving the CPU. In most cases, this makes the transfer
> faster.

And if I remember correctly, DMA is used by cards with CPUs on them
(Accelerators, CP/M Cards), the High Speed SCSI Card and not much else
in the Apple II world. Please correct me if I'm wrong.

-- 
Linards Ticmanis