You could do multiple lines of text, however it is more difficult without libraries. You could attempt with Celtic III (for monochrome) or Celtic II CSE (for CSE calculators) and Celtic CE (for CE calculators) , by creating a program for you to edit the text in and shift lines based off of where the cursor is. For example, you could create a program with empty lines of code, start the cursor on line one.
Assuming you have Celtic installed…
(Note, I am using the home screen for simplicity)
For(I,4,5
det(0,I,"A
End
1→L:1→P:"→Str1 //Don't do a space, just keep the string null. Initialize L (lines of the program) and P (line Y position)
Repeat K=22 //Change the exit key from ENTER to MODE, Loop 1
det(5,"A",P //Read line P from program A
If Ans=".NULLINE" or Ans=".NULLSTR //If the line is null, instead of displaying the error display a space instead
" //One Space
Output(P,1,Ans
Repeat max(K={22,105,25,34,45,23 //Loop 2
"
If length(Str1:Str1
Output(P,1,Ans
Output(P,1+length(Str1),"| //The cursor along with a space after it
Repeat Ans //Loop 3
getKey→K
End //End of Loop 3
If Ans>40 and Ans<94 and 16>length(Str1):Then //16 if you're on monochrome, 26 if you're on color
sub("ABC DEFGHIJKLMNOPQRSTUVWXYZ",Ans-20-5int(.1Ans),1
If length(Str1
Str1+Ans→Str1
If not(length(Str1
Ans→Str1
End
End //End of Loop 2
If K=23 and 1<length(Str1 //Delete character for the string
Then
If 1=length(Str1
"→Str1
If 1<length(Str1
sub(Str1,1,length(Str1)-1→Str1 //No need to add a space for the text because the space after the cursor takes care of that
End
If K=45:Then //Clear the string
"→Str1
For(J,1,16
Output(P,J," //One space
End
End
If K=105:Then //Create a new line below the current line, not 100% sure if this is valid
det(6,"A",det(17,"3F"),P //Write the new line character at P so it makes a new line below
End
If max(K={25,34:Then
If length(Str1
det(8,"A",Str1,P
" //One space
If length(Str1
Str1+" //One space after
Output(P,1,Ans
max(1,min(L,P+(K=34)-(K=25→P
End
End //End of Loop 1
After the program ends, everything you edited is stored into Program A. It might not be perfect because I coded this from memory. This program is assuming you're using a monochrome calculator with Celtic III, but if you're using a color calculator with Celtic II CSE or Celtic CE then let me know so I can revise it.
However this program is a multi-line editing routine, however it is a simple program and only handles 8 lines of text. Anything more it will throw an error. Hopefully this is something you're looking for!
This program isn't really simple, but it gets the job done. You could do this without libraries but it would be much more complex and harder to understand.
