OS/2, eCS & ArcaOS - Technical > Applications

OS/2 Architecture Illustration

<< < (2/2)

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.

Navigation

[0] Message Index

[*] Previous page

Go to full version