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IIgs DMA question [message #380739]

Tue, 05 February 2019 22:43

Anonymous

Karma:

Originally posted by: James Kruth

I'm planning on purchasing a GGLabs 8MB expansion for my IIgs but was wondering about the DMA implications. Specifically, I'm wondering if DMA is disabled entirely if 8MB of RAM is present, or just disabled for the upper 4MB? That is, if I have 8MB of memory, is DMA still possible in the lower 4MB?

I don't currently have any DMA compatible cards, but I'd like to know how this my affect my options in the future.

Thanks!

- James

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Re: IIgs DMA question [message #380740 is a reply to message #380739]

Tue, 05 February 2019 22:55

Wayne Stewart
Messages: 306
Registered: September 2012

Karma: 0

Senior Member

It’ll still do DMA in the first 4mb, just won’t do it in the last 4mb. I think they mention that in their specs

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Re: IIgs DMA question [message #380745 is a reply to message #380740]

Tue, 05 February 2019 23:00

Anonymous

Karma:

Originally posted by: James Kruth

Thank you! I suspected, but was unable to confirm that on my own. It's likely I just couldn't find the proper spec. Thanks again!

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