Midscanline CHR bank switch demo

A place where you can keep others updated about your NES-related projects through screenshots, videos or information in general.

Moderator: Moderators

Post Reply
User avatar
Bregalad
Posts: 8060
Joined: Fri Nov 12, 2004 2:49 pm
Location: Divonne-les-bains, France

Midscanline CHR bank switch demo

Post by Bregalad »

My good old mid-scanline demo from 2009 uploaded again.

It shows how to change CHR-ROM banks mid-scanline to bypass the 256-tiles limitation. In this example it alternate between the playfield CHR bank and the letter's CHR bank, simulating what the MMC4 does by hardware in Fire Emblem.

I added a second variant of it which changes the low 3 bit of the scrolling by writes to $2005.1
It's less impressive though.

Comes with NTSC and PAL variants, all tested on hardware (powerpak).
Attachments
midscanline.7z
(18.12 KiB) Downloaded 327 times
Post Reply