The code change only affects readCHR(). It shortens the check to a single byte but that is enough to identify the four VRC4e carts. The original list of VRC4e carts that I referenced only showed Boku Dracula-kun and Tiny Toon Adventures. I found out that all four of the Mapper 23 VRC4 carts use the VRC4e submapper. Mapper 23 includes VRC4f but there are no known examples (BTW, VRC4f = VRC2b).
Changes:
Adds Mapper 30 (NESmaker) support with read/write Flash support.
Adds PRG-RAM read/write support for Mappers 4 (MMC6), 19, 80, 82.
Adds SRAM support for Family Basic (Mapper 0) carts.
