That code is working great for me in PPSSPP (OpenGL on Mac). Finally SOTN PSP version with square pixels! No issues with garbled text. For reference:
_C0 (Requires restart and display size - full)
_C0 Symphony of the Night original res
_L 0xE0100001 0x0010000C
_L 0xE00F0100 0x1011D8CC
_L...