The Japanese did these "type-in" source code listings really well, much better than I saw growing up in England. They eventually adopted entering complicated li

The Japanese did these "type-in" source code listings really well, much better than I saw growing up in England. They eventually adopted entering complicated listings as hex code with checksums, which was both faster and less error prone but of course less readable. The bootstrap code would spit out the line where the error was when the checksum failed and you could easily correct in small groups.