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FreeDOS on SBC188 (Announce)

posted by ecm Homepage E-mail, Düsseldorf, Germany, 15.09.2020, 13:53

> Thus C0000..EFFFF regions are available as Upper Memory Blocks.
>
> B0000.BFFFF are the MDA and VGA a/n regions. A0000..AFFFF would normally
> be Graphic memory. But with no graphics cards for the ECB bus, this is the
> area for use by EMM. This is a somewhat odd arrangement, but is dictated
> by the 80C188 on-board memory mapping hardware. Consult the datasheet for
> the chip, and note especially the restrictions on use of the Middle Memory
> Map: its location must be an exact multiple of its size.
>
> Making use of the UMB's is a good idea.
Do you know a way to detect the SBC188 system? If so I could adapt the UMB driver.

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l

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