Read faulty tape to the spots that needed correction. Type in the changes. Write corrected program to fresh tape.
http://en.wikipedia.org/wiki/TECO_(text_editor)
How to change "Hello" to "Goodbye", from the above:
*EBhello.c$$ Open file for read/write with backup *P$$ Read in the first page *SHello$0TT$$ Search for "Hello" and print the line printf("Hello world!\n"); The line *-5DIGoodbye$0TT$$ Delete "Hello", insert "Goodbye", and print the line printf("Goodbye world!\n"); The updated line *EX$$ Copy the remainder of the file and exit
Then there were punched cards. There would be one card per line with punches to encode the characters and the characters dot-matrix printed across the top. To edit, you
At some point in the seventies, they introduced a new, improved key punch machine which had a buffer that could hold a one card in memory. It didn't have a display, however, just a two-digit position readout. However, if you realized you made a typo, you could back up and re-key. It didn't physically punch the card until you were done and hit the Release key.
Thanks. That looks right (shaking cobwebs from cerebrum). Punch cards were never a problem. Those I remember how to do.
I bow to superior old school knowledge!