Re: Apple II GS Questions

[bpvh@primenet.com (Bradley P. Von Haden)]

supertimer@aol.com (Supertimer) wrote:

>More than 5MB on a ROM 3 unit will result in the need to disable
>DMA on the Apple High Speed SCSI card and the older (pre-revision
>D) RamFAST unit.  The revision D RamFAST unit can DMA easily with
>8MB, so that card will solve this problem.  Apple and early
>RamFAST SCSI users just need to turn off DMA, which slows down
>their hard drive access a little.  Later RamFAST users do not need
>to do this and can run their hard drives with full DMA speed.

At least with my ROM 3 (or my ROM 1 for that matter), my Apple High
Speed SCSI card, my 6 meg AE GS-RAM+ memory card, and my ZipGS
(8Mhz), I do not have to turn off DMA.  Of course, when doing file
copies of larger than a certain size (4 megs?) DMA will go off
automatically.  The turning off and on is transparent to the user.


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