OS/2, eCS & ArcaOS - Technical > Applications
OS/2 Architecture Illustration
Greg Pringle:
Here are some pages from "The Design of OS/2" 32-BIT OS/2 by H.M. Deitel and M.S. Kogan 1992
This is from the Presentation Management chapter.
Dave Yeo:
--- Quote from: Greg Pringle on March 12, 2025, 02:46:22 pm ---Here are some pages from "The Design of OS/2" 32-BIT OS/2 by H.M. Deitel and M.S. Kogan 1992
This is from the Presentation Management chapter.
--- End quote ---
Hi Greg, thanks for this.
Reading, OS/2 1.x graphics engine used ring 2 to directly write to the graphics buffer. Presumably OS/2 2.x may have kept the same behaviour but the pages posted don't clarify whether that assumption is true.
I still think DOS also used ring 2, at least on OS/2 2.x to support DOS device drivers.
Greg Pringle:
--- Quote from: Dave Yeo on March 12, 2025, 06:02:03 pm ---Hi Greg, thanks for this.
Reading, OS/2 1.x graphics engine used ring 2 to directly write to the graphics buffer. Presumably OS/2 2.x may have kept the same behaviour but the pages posted don't clarify whether that assumption is true.
I still think DOS also used ring 2, at least on OS/2 2.x to support DOS device drivers.
--- End quote ---
Your welcome. I also have this other book in pdf format and here is page 2 on ring 2 and IO.
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