Area 5150 on IBM5155 with modified Graphics Gremlin with HDMI (using special CGA overscan mode)

The graphics card has been set into a mode to specifically display the overscan area since Area5150 uses this.

Showing the overscan section should not be normally done as it leads to non-standard resolutions and weird display signaling so many monitors run into problems receiving this input. My 4K monitor happens to be one of the few to at least make an attempt to display this.

There are many display errors in this demo and some problems could be inherent to the original Graphics Gremlin, configuration of my system or the force display of overscan.

HDMI: Dell S2721QS 4K monitor
Composite: Small LCD monitor

More details:

[kaerucraft]

5:18 Look at the women's face on the monochrome CRT in the bottom-right 😨😨

[JimLeonard]

Thank you for giving this a test. Area 5150 is a torture test, so it's understandable that not everything could display, but even using stock video modes there is a border displayed around the text area that can be changed by the color selector register (this is one of the tests in the CGA compatibility tester). Maybe some sort of compromise can be struck that can allow that to work? Such as rendering to an 800 by 600 frame to output a standard mode?