Strategies for 1 pixel vertical scrolling on 9918 VDP (MSX 1)

yes, i know, (call it level1 hw scrolling opposite to the more advanced vertical scroll level2 ).
And given the almost already done level1 horz scrolling this make me strongly suspecting that the level2 horizontal scrolling was a planned v9938 feature. would be ingteresting to find some proof of this in v9938

(like some ispection of the v9938 die so see if there is some circuit for level2 hw horz scrolling deactivated because not fully working)

Use the above in screen 4 on MSX2 and combine it with some static tiles and adjust register scrolling, and you’ll have a parallax background scroll.

And then if the background is monochrome (which can still look pretty good I think for silhouettes of mountains etc) you don’t even need to update the colour table.

No sorry, you need to explore Atariage to have a view on how to use it
In the end I use my own scripts in matlab, I use Magellan only for tests and I tend to export data in binary

Finally completed the drawing of scrolling background for the future Pacific 2:
https://youtu.be/HcYkt_MvsZ4

Edit: as always, the youtube video is flickering, not sure why. The real animation is better.

It's running at the same speed as the old background with only water, which is great.
The startegy chosen is to have all the tiles with all its frames pre loaded on pattern tables and change only the names table.
Of course it greatly limits the number of possible patterns, but I managed to create a set which is possible to be used to make many shapes. I'm pretty much satisfied with the result. Only the trees are a little more squared than ideal...

I have saved for bg tiles 208 chars of the 256 available. As each of them should have 8 animation frames it means that only 26 shapes are used (actually even less, as it is the number of transitions of shapes instead of the own shapes).

As an undesired side effetc, the contrast between the sprites and the backgroud was reduced, making it even more hard to dodge the fast enemies/shots. I'm tempted to cut by half the speed of them.

Well, hope you enjoy.

No, I didn't even know the openMSX has this feature. I used it to play the game as usual and the standard Windows XBox Game Bar to record the video. I Will check this alternative.

The player shot already alternate between red and white. Maybe increasing the size of enemy shots, cycling colors and reducing speeed it became human possible to avoid them.