Glad you saw the posted drawing, and also replied.
On my original, the back panel was a green. Did you change it to a red or is that how AutoCad interpreted it?
Nope, didn't change any colors.
Maybe the color (number) you used in your CAD Application was interpreted by my CAD Application as Red, or maybe it was from translation to .DXF on your end, or translation from .DXF to .DWG on my end.
Is .DXF the "Natural" file format your Application saves as, or do you need to specify .DXF as an alternate save choice (or as an "exported" choice)?
I used a "Generic" Real-Mode (DOS based) CAD Application on my old 80386sx based PC, back in late 1992 - through 1993, but cannot remember the name. It worked without requiring the 80387 "Math Co-Processor" (FPU) being installed.
Also used a Real-Mode / DOS environment AutoCAD Application (version 11?) between late 1993 through mid 1994, after installing the 80387 FPU.
Ended up using a Windows Environment version of AutoCAD LT from 1994 through 1996, which was sssslllllooooowwwwwww when working on heavy drawings.
Think the version was "AutoCAD LT For Windows, version 2", which I believe was a stripped down version of Release 12, but written for use in a Windows Environment, and in "Virtual 386 Mode", or "Enhanced Mode", rather than running "out of the shell" in a Protected Mode Interface (man, its been a long time!)
Of course, this was under the old Windows 3.1 Shell, on top of DOS 6.2.
Things improved when I installed Windows 3.11 (Windows for Workgroups) on a freshly formatted fixed disk drive!
I'll probably be sending some more now that we know that they work.
Let me know if the background of any drawings should be "White", so I can alter my user settings prior to an export command.
Used to change background to "White" before exporting, but now I just leave it "Black".