thanks cluster for this awesome hack!!!
all works fine except the kachikachi mapper support is really troublesome...
the original japanese version of Portopia Serial Murder Case is mapper 0 (NROM, no mapper) and works fine. after patching the english translation (Rev. B) the mapper is changed to 68 (Sunsoft 4) which is not supported. i forced the flash and it gives error c6. there is a patch available (for repro purposes) that changes the mapper back to 2 (UxROM) which should be supported. works fine in latest windows emus (fceux, nestopia and punes) but on mini nes it just gives a black screen although the music is playing.
i get the same behavior with the game Lala the Magical (PD rom released 2016-12) which uses mapper 66 (GxROM). although not supported, after force flash it gives the same problem as Portopia (black screen, music playing but no video output).
i tried tinkering the ines header but to no avail, btw does kachikachi respect ines header 2.0 specs?
next i will try:
Sweet Home with latest 2017 english addendum
Mother/Earthbound 25th Faithful Edition
Metroid Rogue Dawn (i think already tested with some gameplay glitches)
Ganbare Goemon! Karakuri Douchuu english
Jesus Kyoufu no Bio Monster english
Digital Devil Monogatari Megami Tensei english
and some more, i will report the results...
looking forward to mute/disable bg music and hopefully some mapper fixes