Emulator : BizHawk Version 2.8 (x64) Core : BSNES

01421A  A0 D0       LDY #$D0
01421C  20 E5 00    JSR $00E5
0100E5  8C C7 19    STY $19C7
0100E8  4C 87 EF    JMP $EF87