bsnes/higan/ws/cpu/memory.cpp

auto CPU::ramRead(uint16 addr) -> uint8 {
  if(WS() && addr >= 0x4000) return 0x90;
  return iram[addr];
}

auto CPU::ramWrite(uint16 addr, uint8 data) -> void {
  if(WS() && addr >= 0x4000) return;
  iram[addr] = data;
}