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## Direct3D Bug: Display flickering frequently

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ppgrainbow
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### Direct3D Bug: Display flickering frequently

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Post by ppgrainbow » Mon 10 Aug, 2015 11:04 pm

Does anyone have a problem running the latest revision of PCem v9 using the Direct3D video mode?
For me, I'm currently running the Award SiS 496/497 machine (486DX2 @ 66 MHz with 64 MB RAM, Number Nine FX graphics card with 2 MB VRAM) for example. Text mode and ironically, Windows 3.11 in 1024 x 768 16-bit colours work without problems.
In the Settings menu, I select Video > Direct3D. When I do that, running a program that uses graphics will flicker and go black very frequently. If I select Settings > Video > DirectDraw, the display does not flicker at all.
In the emulated IBM PS/1 model 2011 (80286 10MHz w/16 MB RAM [15,488 KB usable], integrated VGA card), the same issue happens.
When I switch the machine configuration when using the Direct3D video mode, the display literally gets squashed and messed up:

  Display bug.png (54.21 KiB) Viewed 1648 times

This issue doesn't happen in DirectDraw video mode.
Also, when using the debugger version of PCem, looking in the pc.log file, I found a bit of information what could be causing the display to flicker and mess up:

> Bad AT keyboard controller command A8
> Bad AT keyboard controller command BC
> Bad AT keyboard controller command BB
> Bad AT keyboard controller command D2
> Bad AT keyboard command 80

> ARPL_a16

> Set multiple mode - 16

> INT out of range
> Double fault!
> Triple fault!

The "INT out of range", "Double fault!", "Triple fault" error repeat in a infinite loop for a few seconds. That bug and the bad AT keyboard controller commands do not adversely affect the PC emulation at all.
I'm curious to ask here. Could this be a problem with the latest version of the drivers for my EVGA 8400GS 1GB DDR3 graphics card or a bug in the PCem emulation itself?
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