Every 8 lines scrolled horizontally
Posted: Mon Mar 24, 2014 1:50 pm
Why does the VDP scroll every 8 lines horizontally when I try to scroll only one?
Sega Megadrive/Genesis development
https://gendev.spritesmind.net/forum/
https://gendev.spritesmind.net/forum/viewtopic.php?f=22&t=1733
There's two line scrolling modes, 1 and 3. Mode 1 re-uses the first 8 words of the scroll table and applies them to all display lines, mode 3 maps the scroll table words to display lines like normal.M-374 LX wrote:I have found the problem: register 0x0B was set to 1. Changing it to 3 solves the problem.
Nevertheless, according to Charles MacDonald's VDP document, it should if the register is set to 1. So, this seems to be a mistake in that document.