eOpcodeResult ProcessOneCommand()
{
    unsigned short id = *(unsigned short *)&CScripts::space[m_pc] & 0x7FFF;
    if(*(unsigned short *)&CScripts::space[m_pc] & 0x8000)
        m_bNegFlag = true;
    else
        m_bNegFlag = false;
    m_pc += 2;
    // check for user (default replacement) opcodes here
    for(auto i = CScripts::defaultOpcodeReplacement.begin(); i < CScripts::defaultOpcodeReplacement.end; i++)
    {
        if((*i).opcodeId == id)
            return (*i).opcodeFunc(this, id);
    }
    //
    switch(id)
    {
    case 0x004C: // GOTO_IF_TRUE
        Collect(1);
        if(m_bCompareFlag)
            JumpTo(CScripts::params.intParam[0]);
        return RET_CONTINUE;
    case 0x004D: // GOTO_IF_FALSE
        Collect(1);
        if(!m_bCompareFlag)
            JumpTo(CScripts::params.intParam[0]);
        return RET_CONTINUE;
    case 0x0002: // GOTO
        Collect(1);
        JumpTo(CScripts::params.intParam[0]);
        return RET_CONTINUE;
    case 0x0050: // GOSUB
        Collect(1);
        m_aRetAddr[m_nCountRet++] = m_pc;
        JumpTo(CScripts::params.intParam[0]);
        return RET_CONTINUE;
    default:
        if(id >= CUSTOM_OPCODES_START_ID)
            return CScripts::customOpcodes[id - CUSTOM_OPCODES_START_ID](this, id);
        return CScripts::defaultOpcodeHandlers[id / 100](this, id);
    }
}