The drawbacks of early structured programming languages include:
1. Lack of portability: Programs written in early structured programming languages were not portable and required modification to run on different computer systems.
2. Limited functionality: Early structured programming languages lacked advanced features and functionality, such as object-oriented programming and graphical user interfaces.
3. Poor error handling: Early structured programming languages often lacked robust error handling capabilities, making it difficult to debug and test programs.
4. Complex syntax: The syntax of early structured programming languages was often complex and difficult to learn, especially for non-technical users.
5. Limited memory and processing power: Early computers had limited memory and processing power, which limited the size and complexity of programs that could be written in early structured programming languages.