try to edit memsize from 16 to 63

I wonder if GOG will update all dosbox games to this new version...

I missed the edits.. The topic doesn't get "fresh" when edited.

Well, I primary tested the opengl scaling with 320x200, as that is a very common resolution in the games that I have installed.
So it is possible I missed a problem.
Your description is a bit hard to follow though. What doesn't work ? As you are mixing a lot of information on that one long line.

No, not specifically. I wasn't aware of it being a problem, so I have never debugged it.. While sounding cheap. This is something you should take up with GOG support. They are the ones selling you it. (It isn't being cheap. I have no idea on how they have setup the game, what kind of patches they applied) It seems that -lowmem fixes it ? There are tons of things to try.. loadfix -f before starting, increasing the memory size as stated by fulval, possibly using another protected mode extender.
Okay, so you are using scanlines. and they look bad according to you.
How about openglnb ? Does that change it ?

Nope, that output works as ddraw and overlay, so bad...

only opengl is good, but only for 320x200 and 320x240 games
(remember that these scanlines are NOT the same real scanlines that all CRT displays have)

scan2x or scan3x and windowed or fullscreen ?
What is your dpi (display scaling) set to ? (100% or higher?)
I am sorry for the questions. The scaling code of dosbox is complex and it is influenced by a lot of things.

I've tested only fullscreen for now; with scan3x all scanlines are too black

this scanlines problem happen with all emulators...

dpi 100%, it's a 1080p display


with 4:3 display is different

too black ? What colour do you want them to have then ? Got to check how they look in 320x200 fullscreen then.

with scan2x are better

I have checked it out a bit.
With scan2x you have for the lines:
Input (line 1)
Black
Input (line 2)
Black
Input (line 3)
Black

With scan3x, dosbox (and maybe others as well)
you have:
Input (line 1)
Black
Black
Input (line 2)
Black
Black

Thus the black parts are larger and thus it appears darker.

(scan3x (or any 3x scaler, means that we go from 1 input line, to 3 output lines)
I am pondering a bit on how it could be improved.

It would be easy to change it to
Input (line 1)
Input (line 1)
Black
Input (line 2)
Input (line 2)
Black

But then it might be too light.

Although it might be better to have
Input (line 1)
Black
Input(line 1)
Black
Input(line 2)
Black
Input (line 3)
Black
Input(line 3)

Which would be more difficult to code.
Or:
Input (line 1)
Input (line 1)
Black
Black
Input(line 2)
Input(line 2)
Black
Black
Input(line 3)
Input(line 4)
Black
Black

Which might be ever harder to add..
Ultimately it depends a bit on personal preference...

Might need to make some screenshots of the different cases and get some opinions (including yours) to see what is preferred.

Some example are here https://www.google.it/search?safe=active&hl=it&tbm=isch&source=hp&biw=1920&bih=969&ei=A6ObW9aYM8utswHM6YPADQ&q=scanlines+crt&oq=scanlines+crt&gs_l=img.3..0i8i30k1.1035.3657.0.3761.10.10.0.0.0.0.177.808.8j1.9.0....0...1ac.1.64.img..1.9.808.0..0j0i30k1j0i10i30k1.0.DpY7PO0H46o

but i think that it's impossible

https://upload.wikimedia.org/wikipedia/commons/4/4d/Pixel_geometry_01_Pengo.jpg

Judging from those screenshots
line 1
line 1
black
line 2
line 2
black

would be more accurate compared to the current
line 1
black
black
line 2
black
black

However to get it really similar with that flowing like stuff, a shader would be needed.

In the case of scan 3x, it might not look too bad if some black spots were introduced in the horizontal direction as well...
so
1 2
3 4
as input would result in:
1 1 B 2 2 B
1 1 B 2 2 B
B B B B B B
3 3 B 4 4 B
3 3 B 4 4 B
B B B B B B

vs
1 1 1 2 2 2
1 1 1 2 2 2
B B B B B B
3 3 3 4 4 4
3 3 3 4 4 4
B B B B B B


(and the current one for reference:
1 1 1 2 2 2
B B B B B B
B B B B B B
3 3 3 4 4 4
B B B B B B
B B B B B B

Please give the attached images a look.

The llbhor might be a bit over the top. But the llb feels better than current

(anybody reading this, feel free to comment on it.)
This is about the scan3x scaler, which "simulates" scanlines in a simple way.
scan3x_current => how it is in 0.74-2
scan3x_llb => middle line swapped compared 0.74
scan3x_llbhor => middle line swapped + fake vertical black lines

I don't recall exactly the correct looks of scanlines for me, but among those 3 images, I'd say:

scan3x_current -> seems way too dark..
scan3x_llb -> maybe the best one?
scan3x_llbhor -> uh.. no, that looks like a grid