@JimmyFromTheBay

On old mame pages I found that the tapes with BASIC would be supported, yet they don't load in 265 or 266.
BASICs are respectively mz1z001 and mz1z002.
Could also be that some tape games need these BASICs to work.
You are able to find manuals but they are all in Japanese but it gives an impression.
There seem to be better emulators and and also some info can be found on websites containing sharpmz in the address.
Though it's quite difficult to know what all commands do inside tf-dos and in BASIC should that work.
However BASIC seems to be from Microsoft so I think it has a lot of similarities.

Found that you can type HELP in tf-dos to find the commands.
You can use DIR to list the files.

@sleve_mcdichael That did the trick. Scanlines gone. Thanks all!

@JimmyFromTheBay

I've installed the MESS fork for it (lr-mess-mz1500-cass).

What is the MESS fork ?
Please give a better explanation on how you installed.

With this command you can find the supported extensions :

pi@raspberrypi:~ $ /opt/retropie/emulators/mame/mame -listmedia mz1500 SYSTEM MEDIA NAME (brief) IMAGE FILE EXTENSIONS SUPPORTED ---------------- --------------------------- ------------------------------- mz1500 cassette (cass) .wav .m12 .mzf .mzt

These are the loading instructions for MZ-1500 :
Hit C key
TAB > Tape control > Play

I used cassette files inside mz800_cass.zip from mame-sl.
mucmac.zip worked for me.

as far as i recall the shader preset includes bilinear on/off, so you should not touch it and let the preset decide

@thelostsoul said in Secret of Mana 2 - Very strange blurry to sharp problem:

Is there a list for such games?

just google for interlaced games for the console in question. eg http://nerdlypleasures.blogspot.com/2017/10/the-rise-of-interlacing-in-video-game.html

following that link, i should correct myself in saying that SOM may use a higher horizontal resolution, rather than an interlaced mode. still, the effect is the same; your shader is doing some sort of per-pixel shadow mask, but the game changes the amount of horizontal pixels, so it's going to look different in those scenes.

And whats the best way to do exceptions and set different shader for single games?

per game overrides.