All 0s and 1s pt.2

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Last week, I wrote a blogpost that probably didn't make a lot of sense.

"I don't really understand the programming, but from your description I can definitely follow the process behind making the poem." - Anonymous

"I don't know how the LC-3 assembly language works..." - Anonymous

"I thought it was an interesting choice to include all the coding that you did even though I didn't understand any of it." - Anonymous

I tried to put forth a whole bunch of code without much explaining. While the comments to the code were there, there was obviously still a lot of confusion regarding the code and the decision to include that mess. 

In this blogpost, I want to explain the code in a form of a poem :)

**Also I made some edits to the code realizing that there were some bugs**

.ORIG x3000 
 
LEA R1,FONT_DATA ;Load the information the program wants to access
LD R2,ZERO   ;Character to print when program finds zeros in memory address
LDR R2,R2,#0 
STR R2,FIRSTCHAR


AND R2,R2,#0


ADD R2,R2,#1


LD R3,ONE    ;Character to print when program finds ones in memory address
LDR R3,R3,#0 


STR R3,SECONDCHAR




AND R3,R3,#0


ADD R3,R3,#1




LD R4,INPUT  ;Load the final character the program wants to express


LDR R4,R4,#0 




START LD R6,FOUR   




NEXT  ADD R4,R4,R4 ;Multiply character value by 16 to get the actual location
ADD R6,R6,#-1 
BRp NEXT 
ADD R5,R5,#0 
BRz ROW



LABEL        ADD R1,R1,R4 ;Now let's go on vacation
             ADD R5,R5,#0
             BRzp NEXTLINE
  


ADD R5,R5,#0
BRp NEW_ROW

ROW  ADD R5,R5,#15  ;For the 16 in 8 by 16 pixel font, I loop through 16 times

NEW_ROW  ADD R5,R5,#0 
         BRn DONE 
  

NEW_CHAR AND R6,R6,#0 ;For the 8 in 8 by 16 pixel font, I loop through 8 times
  ADD R6,R6,#7 
  LDR R4,R1,#0
 
NEW_COLUMN  ADD R6,R6,#0
  BRn NEXTCHAR 

  ADD R4,R4,#0 
  BRzp POSITIVE
  ADD R0,R3,#0   ;One is found, let's print the character!
  OUT 
  BRnzp FORWARD 

POSITIVE ADD R0,R2,#0 ;Zero is found, let's print the character!
  OUT ;print the char
 
FORWARD  ADD R4,R4,R4

  ADD R6,R6,#-1 
  BRnzp NEW_COLUMN 

DONE_ROW  LD R0,ASCII_NL ;Now I want a new line
  OUT
  ADD R5,R5,#-1  ;Transition line by line
  LEA R1,FONT_DATA
  LD R4,INPUT
  LDR R4,R4,#0
  LD R6,FOUR
AGAIN  ADD R4,R4,R4 
  ADD R6,R6,#-1 
  BRp AGAIN
  BRnzp LABEL ;Now we got things to combine
  

NEXTLINE   ;Let's go to the next row


  LD R4,SIXTEEN 
  NOT R6,R5 
  ADD R6,R6,#1 
  ADD R4,R6,R4 
  ADD R1,R1,R4 
  BRnzp NEW_ROW

  
NEXTCHAR ;Let's go to the next column
  LD R4,INPUT 
  ADD R4,R4,R2
  LDR R4,R4,#0
  BRz DONE_ROW
  ADD R2,R2,#1
  BRnzp START ;Now do it again!
  
DONE  HALT

ASCII_NL .FILL xA

ZERO  .FILL x5000

ONE   .FILL x5001

INPUT .FILL X5002

FOUR  .FILL x0004

FIRSTCHAR .FILL x0000




SECONDCHAR .FILL x0000




SIXTEEN .FILL x0010








FINAL POEM:




Load the information the program wants to access


Character to print when program finds zeros in memory address




Different character to print when program finds ones in memory address


Load the final character the program wants to express




Multiply character value by 16 to get the actual location




Now let's go on vacation




For the 16 in 8 by 16 pixel font, I loop through 16 times


For the 8 in 8 by 16 pixel font, I loop through 8 times






One is found, let's print the character!


Zero is found, let's print the character!




Now I want a new line


Transition line by line


Now we got things to combine






Let's go to the next row


Let's go to the next column






Now do it again!






















































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