it is possible to dump NES roms from nes classics / famicom mini gba cartridges.
Nintendo made a few changes to the original roms. they changed the date in the title screen, that is understandable. but the biggest change was to the games' fonts.
as the gba screen has lower resolution than Nes and the screen is much wider, texts were harder to read in gba screen. that is a known problem in PocketNES. but for their nes classics series and famicom mini series, nintendo replaced the fonts so they are perfectly readable in GBA. i compared the original nes rom of the legend of Zelda and the rom i extracted from nes classics version, both in PocketNES. the difference is night and day.
i couldn't find the GBA extracted NES roms in any ROM set. Gamecube extracted ones can be found, but not GBA ones afaik.
does anyone have any more info for this?