I want to make an NROM to UNROM/MMC1/MMC3 trainer to expand the list of compatible donor carts for NROM games. Which bank is mapped to those carts' $8000 on power-on? Does it start in the first bank (good), the last bank (good), or an unpredictable bank (tougher; must find 32 bytes of empty data to insert trainer trampoline)? And do MMC1 carts with VRAM bankswitch the VRAM?