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Fooling around with assembly part 2

Entry posted by atari2600land November 7, 2017

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So I spent the better part of 2 hours working on this little project of mine for no apparent reason. I tried to make one lemon using the playfield. All attempts failed. Until I decided to just bite the bullet and make two reflecting lemons. This pleases me now. After all, it's "my history teacher ate lemons," not "a lemon." I don't know why I named it that. I name stuff weird stuff I think up in my head. I don't know what my history teacher ate. Perhaps he did eat lemons. Or maybe he was a she. Or maybe I had more than one. I don't remember, I successfully blocked out all painful memories of school. Well, most of them anyway.

I plugged in my Atari 2600 and put this binary on the Harmony cart. It works great. It's all centered on the screen nice, but with black bars at the top and bottom. I don't know where they came from or why they're there, but at least I made the picture centered. Next up, tomorrow I will add the music. I also spent the day working on the Secret Government Waffle Project. That was hard. This was hard. All programming is hard. Even INTYBasic is hard. Life is hard. But somehow I manage.

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Kiwi 2,777

Posted November 7, 2017

The top bar is the underscan, it's blanked out by VBLANK. And the bottom bar is the Overscan, which is also is being blanked out by VBLANK. TVs back in the days were wide than tall, not showing the top and bottom rows of blank pixels. So that's normal.

Intellivision have VBLANK period top and bottom, which is the border color.

I am too taking up learning Atari 2600 assembly. It's pretty interesting getting stuff displayed on the Atari 2600. The hard part for me is getting the scanline to lock on 262 lines.