Re: "Syntax error in line ..."
Some magazines (later on) used to have a checksumming utility with which you input a line of code, then it gives you a checksum on completion of that line, which you then compared to the one in the magazine listing. If it compares, you continue on with the next line, if it doesn't, you re-input the entire line.
Especially when having to input machine code stuff. Which tend to crash spectacularly should you get just one line wrong.