I haven't got my A-One yet, but reading around, i saw that it's not possible to go back on a previous line to edit 
How can you edit then a previous line , if the apple 1 uses a shift register as frame buffer ? it reloads the values in it ?
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Not sure if the Apple I is the same way, but with my Apple //c I can just do -
10 prin "blah blah blah blah" -enter-
20 end -enter-
oops! I misspelled print!
so, retype the line...
10 print "blah blah blah blah" -enter-
then, to make sure it changed-
list -enter-
10 print "blah blah blah blah"
20 end
Thats all there is to it!
You can't edit previous lines.
Keep in mind that the Apple 1 is a very primitive computer. In those days it was new to have "glass" terminal. Until then it was very common to have paper terminals (teletypes). Editing what was printed to paper was not impossible too.
"Editing" source files in basic for instance was only possible by entering the corrected line again, effectively overwriting the old line with the same line number.
Thanks !!!!
IA-