The Undead demo does not show vertical writing in the center of the screen.
Could you try it with the Glue logic "Custom" option enabled?

It sould be seen in this way:

The coder of Micro64 emulator wrote about this demo:
_"Custom IC" glue logic in micro64 build 703 added, so it runs also under micro64 now. You must set the micro64 settings to C64C specific HW settings:
Sound/"SID chip" => 8580,
Video/"Grey dot glitch" => Yes,
Video/"Color latency glitch" => No,
Video/"Old LightPen IRQ behavior" => No,
CIA/"One cycle delay" => No,
CIA/"One cycle delay on ACK" => Yes,
CIA/"Timer B bug" => No,
CIA/"LightPen delay" => No,
CIA/"Glue logic" => "Custom IC"_
I don't know if this could be helpful.
The same thing, the green vertical letters do not appear to me in the VirtualC64 window.
In which menu is the Glue custom IC option?

... out of curiosity !!!
...but was the problem ? ...the same as the other emulamer demos? ... which?
:+1:
"...but was the problem ? ...the same as the other emulamer demos? ... which?"
With the Errata demo fix, this demo was working fine as well. Hence, I expect that the main issue here was also the timing critical sprite-sprite collision behavior outside the visible screen area.
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