64bit CPU and ISA with DMA?

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▶64bit CPU and ISA with DMA? Anonymous 12/31/17 (Sun) 23:40:14 No.845778 [Watch Thread][Show All Posts]

Is it at all possible to get (or make) a motherboard which supports both 64bit CPUs and ISA with DMA transfers?

The "most recent" board I've been able to find is pic related (link below) but only accepts Pentium IV era CPUs.

The same manufacturer only lists ISA without DMA for 64bit CPUs.

So my question is, what are the hardware limitations that make 64bit and DMA impossible or infeasible to mix?

Is this a CPU problem or a motherboard design problem? As in, is can 64bit code do old fashioned 8 or 16bit era DMA transfers, using the equivalent of an 8237 chip?

http://adek.com/product/mb-800v-industrial-atx-motherboard/

▶Anonymous 01/01/18 (Mon) 00:01:57 No.845781>>845788

>Is it at all possible to get (or make) a motherboard which supports both 64bit CPUs and ISA with DMA transfers?

Yes

>So my question is, what are the hardware limitations that make 64bit and DMA impossible or infeasible to mix?

None unless imposed by the manufacturer that put the IOMMU on the board in agreement with the chipmaker for the CPU like jewtel. Most limitations are made in software like for windows.

>Is this a CPU problem or a motherboard design problem?

Motherboard problem https://archive.fo/xCBbx .

>As in, is can 64bit code do old fashioned 8 or 16bit era DMA transfers, using the equivalent of an 8237 chip?

Yes it can https://archive.fo/AS31f if the IOMMU supports it. Why is it you want to do this though?

▶Anonymous 01/01/18 (Mon) 00:16:10 No.845788

>>845781

>Why is it you want to do this though?

I've been doing a little retroprogramming in dosbox, and was wondering if I could try this on a real hardware with modern CPU and an old Sound Blaster 16. Finding all the required parts is going to be a hard though.

▶Anonymous 01/03/18 (Wed) 10:57:23 No.846851

These boards don't support DMA on the ISA slots, which the Sound Blaster 16 requires.

/tech/ - Technology★

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