Big update

6 files changed, 1145 insertions, 28 deletions

@@ -0,0 +1,500 @@
+  Add two values
+from https://en.wikipedia.org/wiki/Brainfuck#Adding_two_values
+
+
+
+
+ALL ABOARD
+chug chug
+END OF THE LINE
+       Cell c0 = 2
+
+ALL ABOARD
+choo
+
+END OF THE LINE
+
+ALL ABOARD
+chug chug chug chug chug
+END OF THE LINE
+  Cell c1 = 5
+
+
+ALL ABOARD
+tickets please
+END OF THE LINE
+        Start your loops with your cell pointer on the loop counter (c1 in our case)
+
+ALL ABOARD
+choo choo
+
+END OF THE LINE
+
+ALL ABOARD
+chug
+END OF THE LINE
+      Add 1 to c0
+
+ALL ABOARD
+choo
+
+END OF THE LINE
+
+ALL ABOARD
+chugga
+END OF THE LINE
+      Subtract 1 from c1
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+        End your loops with the cell pointer on the loop counter
+
+At this point our program has added 5 to 2 leaving 7 in c0 and 0 in c1
+but we cannot output this value to the terminal since it is not ASCII encoded
+
+To display the ASCII character "7" we must add 48 to the value 7
+We use a loop to compute 48 = 6 * 8
+
+
+ALL ABOARD
+chug chug chug chug
+END OF THE LINE
+
+ALL ABOARD
+chug chug chug chug
+END OF THE LINE
+  c1 = 8 and this will be our loop counter again
+
+ALL ABOARD
+tickets please
+choo choo
+
+END OF THE LINE
+
+ALL ABOARD
+chug chug chug
+END OF THE LINE
+
+ALL ABOARD
+chug chug chug
+END OF THE LINE
+  Add 6 to c0
+
+ALL ABOARD
+choo
+
+END OF THE LINE
+
+ALL ABOARD
+chugga
+END OF THE LINE
+        Subtract 1 from c1
+
+ALL ABOARD
+your ticket please
+choo choo
+
+END OF THE LINE
+
+ALL ABOARD
+click
+END OF THE LINE
+        Print out c0 which has the value 55 which translates to "7"!
+
+Finally print a newline:
+
+ALL ABOARD
+chugga chugga chugga chugga chugga chugga chugga chugga chugga chugga chugga
+chugga chugga chugga chugga chugga chugga chugga chugga chugga chugga chugga
+chugga chugga chugga chugga chugga chugga chugga chugga chugga chugga chugga
+chugga chugga chugga chugga chugga chugga chugga chugga chugga chugga chugga
+chugga click
+  This program prints "Hello World!" and a newline to the screen, its
+length is 106 active command characters. [It is not the shortest.]
+
+This loop is an "initial comment loop", a simple way of adding a comment
+to a BF program such that you don't have to worry about any command
+characters. Any ".", ",", "+", "-", "<" and ">" characters are simply
+ignored, the "[" and "]" characters just have to be balanced. This
+loop and the commands it contains are ignored because the current cell
+defaults to a value of 0; the 0 value causes this loop to be skipped.
+
+from https://en.wikipedia.org/wiki/Brainfuck#Hello_World!
+
+
+ALL ABOARD
+chug chug chug chug chug chug chug chug
+END OF THE LINE
+        Set Cell #0 to 8
+
+ALL ABOARD
+tickets please
+choo
+chug chug chug chug
+END OF THE LINE
+                Add 4 to Cell #1; this will always set Cell #1 to 4
+
+ALL ABOARD
+tickets please
+END OF THE LINE
+                as the cell will be cleared by the loop
+
+ALL ABOARD
+choo
+chug chug
+END OF THE LINE
+                Add 2 to Cell #2
+
+ALL ABOARD
+choo
+chug chug chug
+END OF THE LINE
+                Add 3 to Cell #3
+
+ALL ABOARD
+choo
+chug chug chug
+END OF THE LINE
+                Add 3 to Cell #4
+
+ALL ABOARD
+choo
+chug
+END OF THE LINE
+                Add 1 to Cell #5
+
+ALL ABOARD
+choo choo
+choo choo
+choo choo
+choo choo
+chugga
+END OF THE LINE
+                Decrement the loop counter in Cell #1
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                Loop until Cell #1 is zero; number of iterations is 4
+
+ALL ABOARD
+choo
+chug
+END OF THE LINE
+                Add 1 to Cell #2
+
+ALL ABOARD
+choo
+chug
+END OF THE LINE
+                Add 1 to Cell #3
+
+ALL ABOARD
+choo
+chugga
+END OF THE LINE
+                Subtract 1 from Cell #4
+
+ALL ABOARD
+choo
+choo
+chug
+END OF THE LINE
+                Add 1 to Cell #6
+
+ALL ABOARD
+tickets please choo choo
+your ticket please
+END OF THE LINE
+                Move back to the first zero cell you find; this will
+                be Cell #1 which was cleared by the previous loop
+
+ALL ABOARD
+choo choo
+chugga
+END OF THE LINE
+                Decrement the loop Counter in Cell #0
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                Loop until Cell #0 is zero; number of iterations is 8
+
+The result of this is:
+Cell no :   0   1   2   3   4   5   6
+Contents:   0   0  72 104  88  32   8
+Pointer :   ^
+
+
+ALL ABOARD
+choo
+choo
+click
+END OF THE LINE
+                        Cell #2 has value 72 which is 'H'
+
+ALL ABOARD
+choo
+chugga chugga chugga click
+END OF THE LINE
+                        Subtract 3 from Cell #3 to get 101 which is 'e'
+
+ALL ABOARD
+chug chug chug chug chug chug chug clickety click chug chug chug click
+
+END OF THE LINE
+                Likewise for 'llo' from Cell #3
+
+ALL ABOARD
+choo
+choo
+click
+END OF THE LINE
+                        Cell #5 is 32 for the space
+
+ALL ABOARD
+choo choo
+chugga clickety
+END OF THE LINE
+                        Subtract 1 from Cell #4 for 87 to give a 'W'
+
+ALL ABOARD
+choo choo
+clickety
+END OF THE LINE
+                        Cell #3 was set to 'o' from the end of 'Hello'
+
+ALL ABOARD
+chug chug chug click chugga chugga chugga chugga chugga chugga clickety
+chugga chugga chugga chugga chugga chugga chugga chugga click
+END OF THE LINE
+        Cell #3 for 'rl' and 'd'
+
+ALL ABOARD
+choo
+choo
+chug click
+END OF THE LINE
+                        Add 1 to Cell #5 gives us an exclamation point
+
+ALL ABOARD
+choo
+chug chug click
+END OF THE LINE
+                        And finally a newline from Cell #6
+  ROT13 in Brainfuck
+from https://en.wikipedia.org/wiki/Brainfuck#ROT13
+
+
+
+
+ALL ABOARD
+chugga clack chug tickets please
+END OF THE LINE
+                         Read first character and start outer character reading loop
+
+ALL ABOARD
+chugga tickets please
+END OF THE LINE
+                       Skip forward if character is 0
+
+ALL ABOARD
+choo
+choo
+chug chug chug chug tickets please choo
+chug chug chug chug chug chug chug chug
+choo choo
+chugga your ticket please
+END OF THE LINE
+  Set up divisor (32) for division loop
+(MEMORY LAYOUT: dividend copy remainder divisor quotient zero zero)
+
+ALL ABOARD
+choo choo
+chug choo choo
+chugga tickets please
+END OF THE LINE
+                Set up dividend (x minus 1) and enter division loop
+
+ALL ABOARD
+choo
+chug choo
+chug choo
+chugga tickets please choo
+choo
+choo
+your ticket please
+END OF THE LINE
+      Increase copy and remainder / reduce divisor / Normal case: skip forward
+
+ALL ABOARD
+choo choo
+tickets please tickets please choo
+chug choo choo
+chugga your ticket please choo
+choo
+chug choo
+your ticket please
+
+END OF THE LINE
+    Special case: move remainder back to divisor and increase quotient
+
+ALL ABOARD
+choo choo
+choo choo
+choo choo
+choo choo
+choo choo
+chugga
+END OF THE LINE
+           Decrement dividend
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                    End division loop
+
+ALL ABOARD
+your ticket please choo
+choo
+choo
+tickets please chugga your ticket please chug
+END OF THE LINE
+                 End skip loop; zero former divisor and reuse space for a flag
+
+ALL ABOARD
+choo
+chugga chugga tickets please chugga tickets please choo choo
+chugga choo
+chug chug chug
+tickets please chugga your ticket please your ticket please your ticket please
+choo choo
+tickets please
+END OF THE LINE
+         Zero that flag unless quotient was 2 or 3; zero quotient; check flag
+
+ALL ABOARD
+chug chug chug chug chug chug chug chug chug chug chug chug choo choo
+tickets please
+
+END OF THE LINE
+       If flag then set up divisor (13) for second division loop
+(MEMORY LAYOUT: zero copy dividend divisor remainder quotient zero zero)
+
+ALL ABOARD
+choo
+chugga tickets please choo
+chug choo
+choo
+your ticket please
+END OF THE LINE
+         Reduce divisor; Normal case: increase remainder
+
+ALL ABOARD
+choo
+tickets please chug tickets please choo choo
+chug choo
+chugga your ticket please choo
+chug
+choo
+choo
+your ticket please
+END OF THE LINE
+   Special case: increase remainder / move it back to divisor / increase quotient
+
+ALL ABOARD
+choo choo
+choo choo
+choo choo
+choo choo
+choo choo
+chugga
+END OF THE LINE
+           Decrease dividend
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                    End division loop
+
+ALL ABOARD
+choo
+choo
+tickets please choo choo
+chug choo
+chugga your ticket please
+END OF THE LINE
+             Add remainder back to divisor to get a useful 13
+
+ALL ABOARD
+choo
+tickets please
+END OF THE LINE
+                   Skip forward if quotient was 0
+
+ALL ABOARD
+chugga tickets please
+END OF THE LINE
+               Decrement quotient and skip forward if quotient was 1
+
+ALL ABOARD
+chugga choo choo
+choo choo
+tickets please chugga your ticket please choo
+choo
+
+END OF THE LINE
+     Zero quotient and divisor if quotient was 2
+
+ALL ABOARD
+your ticket please choo choo
+choo choo
+tickets please choo choo
+choo choo
+chugga choo
+choo
+chugga your ticket please choo
+choo
+
+END OF THE LINE
+    Zero divisor and subtract 13 from copy if quotient was 1
+
+ALL ABOARD
+your ticket please choo choo
+choo choo
+tickets please choo choo
+choo choo
+chug choo
+choo
+chugga your ticket please
+END OF THE LINE
+          Zero divisor and add 13 to copy if quotient was 0
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                        End outer skip loop (jump to here if ((character minus 1)/32) was not 2 or 3)
+
+ALL ABOARD
+choo choo
+tickets please chugga your ticket please
+END OF THE LINE
+                     Clear remainder from first division if second division was skipped
+
+ALL ABOARD
+choo choo
+click tickets please chugga your ticket please
+END OF THE LINE
+                    Output ROT13ed character from copy and clear it
+
+ALL ABOARD
+choo choo
+chugga clack chug
+END OF THE LINE
+                     Read next character
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                            End character reading loop
@@ -8,38 +8,37 @@ ignored, the "[" and "]" characters just have to be balanced. This
 loop and the commands it contains are ignored because the current cell
 defaults to a value of 0; the 0 value causes this loop to be skipped.
 
-from https://en.wikipedia.org/wiki/Brainfuck#Hello_World!
-]
-++++++++               Set Cell #0 to 8
+from https://en.wikipedia.org/wiki/Brainfuck#Hello_World! ]
+++++++++        Set Cell #0 to 8
 [
->++++               Add 4 to Cell #1; this will always set Cell #1 to 4
-[                   as the cell will be cleared by the loop
->++             Add 2 to Cell #2
->+++            Add 3 to Cell #3
->+++            Add 3 to Cell #4
->+              Add 1 to Cell #5
-<<<<-           Decrement the loop counter in Cell #1
-]                   Loop until Cell #1 is zero; number of iterations is 4
->+                  Add 1 to Cell #2
->+                  Add 1 to Cell #3
->-                  Subtract 1 from Cell #4
->>+                 Add 1 to Cell #6
-[<]                 Move back to the first zero cell you find; this will
-be Cell #1 which was cleared by the previous loop
-<-                  Decrement the loop Counter in Cell #0
-]                       Loop until Cell #0 is zero; number of iterations is 8
+>++++           Add 4 to Cell #1; this will always set Cell #1 to 4
+[               as the cell will be cleared by the loop
+>++             Add 2 to Cell #2
+>+++            Add 3 to Cell #3
+>+++            Add 3 to Cell #4
+>+              Add 1 to Cell #5
+<<<<-           Decrement the loop counter in Cell #1
+]               Loop until Cell #1 is zero; number of iterations is 4
+>+              Add 1 to Cell #2
+>+              Add 1 to Cell #3
+>-              Subtract 1 from Cell #4
+>>+             Add 1 to Cell #6
+[<]             Move back to the first zero cell you find; this will
+                be Cell #1 which was cleared by the previous loop
+<-              Decrement the loop Counter in Cell #0
+]               Loop until Cell #0 is zero; number of iterations is 8
 
 The result of this is:
 Cell no :   0   1   2   3   4   5   6
 Contents:   0   0  72 104  88  32   8
 Pointer :   ^
 
->>.                     Cell #2 has value 72 which is 'H'
->---.                   Subtract 3 from Cell #3 to get 101 which is 'e'
-+++++++..+++.           Likewise for 'llo' from Cell #3
->>.                     Cell #5 is 32 for the space
-<-.                     Subtract 1 from Cell #4 for 87 to give a 'W'
-<.                      Cell #3 was set to 'o' from the end of 'Hello'
-+++.------.--------.    Cell #3 for 'rl' and 'd'
->>+.                    Add 1 to Cell #5 gives us an exclamation point
->++.                    And finally a newline from Cell #6
+>>.                     Cell #2 has value 72 which is 'H'
+>---.                   Subtract 3 from Cell #3 to get 101 which is 'e'
++++++++..+++.           Likewise for 'llo' from Cell #3
+>>.                     Cell #5 is 32 for the space
+<-.                     Subtract 1 from Cell #4 for 87 to give a 'W'
+<.                      Cell #3 was set to 'o' from the end of 'Hello'
++++.------.--------.    Cell #3 for 'rl' and 'd'
+>>+.                    Add 1 to Cell #5 gives us an exclamation point
+>++.                    And finally a newline from Cell #6
@@ -0,0 +1,388 @@
+  This program prints "Hello World!" and a newline to the screen, its
+length is 106 active command characters. [It is not the shortest.]
+
+This loop is an "initial comment loop", a simple way of adding a comment
+to a BF program such that you don't have to worry about any command
+characters. Any ".", ",", "+", "-", "<" and ">" characters are simply
+ignored, the "[" and "]" characters just have to be balanced. This
+loop and the commands it contains are ignored because the current cell
+defaults to a value of 0; the 0 value causes this loop to be skipped.
+
+from https://en.wikipedia.org/wiki/Brainfuck#Hello_World!
+
+
+ALL ABOARD
+chug chug chug chug chug chug chug chug
+END OF THE LINE
+        Set Cell #0 to 8
+
+ALL ABOARD
+tickets please
+choo
+chug chug chug chug
+END OF THE LINE
+                Add 4 to Cell #1; this will always set Cell #1 to 4
+
+ALL ABOARD
+tickets please
+END OF THE LINE
+                as the cell will be cleared by the loop
+
+ALL ABOARD
+choo
+chug chug
+END OF THE LINE
+                Add 2 to Cell #2
+
+ALL ABOARD
+choo
+chug chug chug
+END OF THE LINE
+                Add 3 to Cell #3
+
+ALL ABOARD
+choo
+chug chug chug
+END OF THE LINE
+                Add 3 to Cell #4
+
+ALL ABOARD
+choo
+chug
+END OF THE LINE
+                Add 1 to Cell #5
+
+ALL ABOARD
+choo choo
+choo choo
+choo choo
+choo choo
+chugga
+END OF THE LINE
+                Decrement the loop counter in Cell #1
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                Loop until Cell #1 is zero; number of iterations is 4
+
+ALL ABOARD
+choo
+chug
+END OF THE LINE
+                Add 1 to Cell #2
+
+ALL ABOARD
+choo
+chug
+END OF THE LINE
+                Add 1 to Cell #3
+
+ALL ABOARD
+choo
+chugga
+END OF THE LINE
+                Subtract 1 from Cell #4
+
+ALL ABOARD
+choo
+choo
+chug
+END OF THE LINE
+                Add 1 to Cell #6
+
+ALL ABOARD
+tickets please choo choo
+your ticket please
+END OF THE LINE
+                Move back to the first zero cell you find; this will
+                be Cell #1 which was cleared by the previous loop
+
+ALL ABOARD
+choo choo
+chugga
+END OF THE LINE
+                Decrement the loop Counter in Cell #0
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                Loop until Cell #0 is zero; number of iterations is 8
+
+The result of this is:
+Cell no :   0   1   2   3   4   5   6
+Contents:   0   0  72 104  88  32   8
+Pointer :   ^
+
+
+ALL ABOARD
+choo
+choo
+click
+END OF THE LINE
+                        Cell #2 has value 72 which is 'H'
+
+ALL ABOARD
+choo
+chugga chugga chugga click
+END OF THE LINE
+                        Subtract 3 from Cell #3 to get 101 which is 'e'
+
+ALL ABOARD
+chug chug chug chug chug chug chug clickety click chug chug chug click
+
+END OF THE LINE
+                Likewise for 'llo' from Cell #3
+
+ALL ABOARD
+choo
+choo
+click
+END OF THE LINE
+                        Cell #5 is 32 for the space
+
+ALL ABOARD
+choo choo
+chugga clickety
+END OF THE LINE
+                        Subtract 1 from Cell #4 for 87 to give a 'W'
+
+ALL ABOARD
+choo choo
+clickety
+END OF THE LINE
+                        Cell #3 was set to 'o' from the end of 'Hello'
+
+ALL ABOARD
+chug chug chug click chugga chugga chugga chugga chugga chugga clickety
+chugga chugga chugga chugga chugga chugga chugga chugga click
+END OF THE LINE
+        Cell #3 for 'rl' and 'd'
+
+ALL ABOARD
+choo
+choo
+chug click
+END OF THE LINE
+                        Add 1 to Cell #5 gives us an exclamation point
+
+ALL ABOARD
+choo
+chug chug click
+END OF THE LINE
+                        And finally a newline from Cell #6
+  ROT13 in Brainfuck
+from https://en.wikipedia.org/wiki/Brainfuck#ROT13
+
+
+
+
+ALL ABOARD
+chugga clack chug tickets please
+END OF THE LINE
+                         Read first character and start outer character reading loop
+
+ALL ABOARD
+chugga tickets please
+END OF THE LINE
+                       Skip forward if character is 0
+
+ALL ABOARD
+choo
+choo
+chug chug chug chug tickets please choo
+chug chug chug chug chug chug chug chug
+choo choo
+chugga your ticket please
+END OF THE LINE
+  Set up divisor (32) for division loop
+(MEMORY LAYOUT: dividend copy remainder divisor quotient zero zero)
+
+ALL ABOARD
+choo choo
+chug choo choo
+chugga tickets please
+END OF THE LINE
+                Set up dividend (x minus 1) and enter division loop
+
+ALL ABOARD
+choo
+chug choo
+chug choo
+chugga tickets please choo
+choo
+choo
+your ticket please
+END OF THE LINE
+      Increase copy and remainder / reduce divisor / Normal case: skip forward
+
+ALL ABOARD
+choo choo
+tickets please tickets please choo
+chug choo choo
+chugga your ticket please choo
+choo
+chug choo
+your ticket please
+
+END OF THE LINE
+    Special case: move remainder back to divisor and increase quotient
+
+ALL ABOARD
+choo choo
+choo choo
+choo choo
+choo choo
+choo choo
+chugga
+END OF THE LINE
+           Decrement dividend
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                    End division loop
+
+ALL ABOARD
+your ticket please choo
+choo
+choo
+tickets please chugga your ticket please chug
+END OF THE LINE
+                 End skip loop; zero former divisor and reuse space for a flag
+
+ALL ABOARD
+choo
+chugga chugga tickets please chugga tickets please choo choo
+chugga choo
+chug chug chug
+tickets please chugga your ticket please your ticket please your ticket please
+choo choo
+tickets please
+END OF THE LINE
+         Zero that flag unless quotient was 2 or 3; zero quotient; check flag
+
+ALL ABOARD
+chug chug chug chug chug chug chug chug chug chug chug chug choo choo
+tickets please
+
+END OF THE LINE
+       If flag then set up divisor (13) for second division loop
+(MEMORY LAYOUT: zero copy dividend divisor remainder quotient zero zero)
+
+ALL ABOARD
+choo
+chugga tickets please choo
+chug choo
+choo
+your ticket please
+END OF THE LINE
+         Reduce divisor; Normal case: increase remainder
+
+ALL ABOARD
+choo
+tickets please chug tickets please choo choo
+chug choo
+chugga your ticket please choo
+chug
+choo
+choo
+your ticket please
+END OF THE LINE
+   Special case: increase remainder / move it back to divisor / increase quotient
+
+ALL ABOARD
+choo choo
+choo choo
+choo choo
+choo choo
+choo choo
+chugga
+END OF THE LINE
+           Decrease dividend
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                    End division loop
+
+ALL ABOARD
+choo
+choo
+tickets please choo choo
+chug choo
+chugga your ticket please
+END OF THE LINE
+             Add remainder back to divisor to get a useful 13
+
+ALL ABOARD
+choo
+tickets please
+END OF THE LINE
+                   Skip forward if quotient was 0
+
+ALL ABOARD
+chugga tickets please
+END OF THE LINE
+               Decrement quotient and skip forward if quotient was 1
+
+ALL ABOARD
+chugga choo choo
+choo choo
+tickets please chugga your ticket please choo
+choo
+
+END OF THE LINE
+     Zero quotient and divisor if quotient was 2
+
+ALL ABOARD
+your ticket please choo choo
+choo choo
+tickets please choo choo
+choo choo
+chugga choo
+choo
+chugga your ticket please choo
+choo
+
+END OF THE LINE
+    Zero divisor and subtract 13 from copy if quotient was 1
+
+ALL ABOARD
+your ticket please choo choo
+choo choo
+tickets please choo choo
+choo choo
+chug choo
+choo
+chugga your ticket please
+END OF THE LINE
+          Zero divisor and add 13 to copy if quotient was 0
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                        End outer skip loop (jump to here if ((character minus 1)/32) was not 2 or 3)
+
+ALL ABOARD
+choo choo
+tickets please chugga your ticket please
+END OF THE LINE
+                     Clear remainder from first division if second division was skipped
+
+ALL ABOARD
+choo choo
+click tickets please chugga your ticket please
+END OF THE LINE
+                    Output ROT13ed character from copy and clear it
+
+ALL ABOARD
+choo choo
+chugga clack chug
+END OF THE LINE
+                     Read next character
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                            End character reading loop
@@ -0,0 +1,5 @@
+[ printchar is a small example input/output trainfuck program.
+it waits for the user to press a key, then prints that key
+and a newline to the screen.
+]
+,.>++++++++++.
@@ -0,0 +1,10 @@
+printchar is a small example input/output trainfuck program.
+it waits for the user to press a key, then prints that key
+and a newline to the screen.
+ALL ABOARD
+clack clickety
+choo
+chug chug chug chug chug
+chug chug chug chug chug
+click
+END OF THE LINE
@@ -0,0 +1,215 @@
+  ROT13 in Brainfuck
+from https://en.wikipedia.org/wiki/Brainfuck#ROT13
+
+
+
+
+ALL ABOARD
+chugga clack chug tickets please
+END OF THE LINE
+                         Read first character and start outer character reading loop
+
+ALL ABOARD
+chugga tickets please
+END OF THE LINE
+                       Skip forward if character is 0
+
+ALL ABOARD
+choo
+choo
+chug chug chug chug tickets please choo
+chug chug chug chug chug chug chug chug
+choo choo
+chugga your ticket please
+END OF THE LINE
+  Set up divisor (32) for division loop
+(MEMORY LAYOUT: dividend copy remainder divisor quotient zero zero)
+
+ALL ABOARD
+choo choo
+chug choo choo
+chugga tickets please
+END OF THE LINE
+                Set up dividend (x minus 1) and enter division loop
+
+ALL ABOARD
+choo
+chug choo
+chug choo
+chugga tickets please choo
+choo
+choo
+your ticket please
+END OF THE LINE
+      Increase copy and remainder / reduce divisor / Normal case: skip forward
+
+ALL ABOARD
+choo choo
+tickets please tickets please choo
+chug choo choo
+chugga your ticket please choo
+choo
+chug choo
+your ticket please
+
+END OF THE LINE
+    Special case: move remainder back to divisor and increase quotient
+
+ALL ABOARD
+choo choo
+choo choo
+choo choo
+choo choo
+choo choo
+chugga
+END OF THE LINE
+           Decrement dividend
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                    End division loop
+
+ALL ABOARD
+your ticket please choo
+choo
+choo
+tickets please chugga your ticket please chug
+END OF THE LINE
+                 End skip loop; zero former divisor and reuse space for a flag
+
+ALL ABOARD
+choo
+chugga chugga tickets please chugga tickets please choo choo
+chugga choo
+chug chug chug
+tickets please chugga your ticket please your ticket please your ticket please
+choo choo
+tickets please
+END OF THE LINE
+         Zero that flag unless quotient was 2 or 3; zero quotient; check flag
+
+ALL ABOARD
+chug chug chug chug chug chug chug chug chug chug chug chug choo choo
+tickets please
+
+END OF THE LINE
+       If flag then set up divisor (13) for second division loop
+(MEMORY LAYOUT: zero copy dividend divisor remainder quotient zero zero)
+
+ALL ABOARD
+choo
+chugga tickets please choo
+chug choo
+choo
+your ticket please
+END OF THE LINE
+         Reduce divisor; Normal case: increase remainder
+
+ALL ABOARD
+choo
+tickets please chug tickets please choo choo
+chug choo
+chugga your ticket please choo
+chug
+choo
+choo
+your ticket please
+END OF THE LINE
+   Special case: increase remainder / move it back to divisor / increase quotient
+
+ALL ABOARD
+choo choo
+choo choo
+choo choo
+choo choo
+choo choo
+chugga
+END OF THE LINE
+           Decrease dividend
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                    End division loop
+
+ALL ABOARD
+choo
+choo
+tickets please choo choo
+chug choo
+chugga your ticket please
+END OF THE LINE
+             Add remainder back to divisor to get a useful 13
+
+ALL ABOARD
+choo
+tickets please
+END OF THE LINE
+                   Skip forward if quotient was 0
+
+ALL ABOARD
+chugga tickets please
+END OF THE LINE
+               Decrement quotient and skip forward if quotient was 1
+
+ALL ABOARD
+chugga choo choo
+choo choo
+tickets please chugga your ticket please choo
+choo
+
+END OF THE LINE
+     Zero quotient and divisor if quotient was 2
+
+ALL ABOARD
+your ticket please choo choo
+choo choo
+tickets please choo choo
+choo choo
+chugga choo
+choo
+chugga your ticket please choo
+choo
+
+END OF THE LINE
+    Zero divisor and subtract 13 from copy if quotient was 1
+
+ALL ABOARD
+your ticket please choo choo
+choo choo
+tickets please choo choo
+choo choo
+chug choo
+choo
+chugga your ticket please
+END OF THE LINE
+          Zero divisor and add 13 to copy if quotient was 0
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                        End outer skip loop (jump to here if ((character minus 1)/32) was not 2 or 3)
+
+ALL ABOARD
+choo choo
+tickets please chugga your ticket please
+END OF THE LINE
+                     Clear remainder from first division if second division was skipped
+
+ALL ABOARD
+choo choo
+click tickets please chugga your ticket please
+END OF THE LINE
+                    Output ROT13ed character from copy and clear it
+
+ALL ABOARD
+choo choo
+chugga clack chug
+END OF THE LINE
+                     Read next character
+
+ALL ABOARD
+your ticket please
+END OF THE LINE
+                            End character reading loop