80 COLUMN · 12 ROW

PUNCH CARD LAB

Punch. Read. Print.
A free browser lab for programming with punch cards.

Usage¥0
Keypunch
00:00¥0
Computer
00:00¥0
Cards
0 cards¥0
⏱ 00:00.0CARD -

Keypunch operator

Tap the chair to sit down.

Choose a difficulty

Finish quickly and cheaply for a better rank. Exceed the card limit and the job is over.

CARD 1 / 3
0/80

Tap the keys or use your keyboard.REL or Enter to send a card. Holes cannot be undone.

Review your cards Swipe horizontally

    READING…

    Compile error

    
        
    
        
    
      
    
      
    
        
    
          
    PUNCH CARD LABInvoice
    
          
    
          
    S
    
          
    Amount due
    
          
    ¥0
    
          
    Time
    Score
    
          
    
          
    Lower is better. All charges are fictional.
    
        
    
        
    
        
    
      
    
    
    

    
    
    
      
      
    
    

    
    
    
      
    PUNCH CARD DEBUGGER¥0READY
    
      
    
        
    
          
      
          
      
          
      
          
          
      Tap a card to enlarge it and punch holes
      
          
        
      
        
      
          
      
          
      
          
      0 STEPSNO VARIABLES
      
          
      
            
            
      
          
      
        
      
      
      
    
      
  
      

  
  
      
  
      Shared cards
      
  
      CARD 001
      Tap to toggle holes. Drag the card or use the slider to change columns.
      
  
      Command guide
      One instruction per card, read from top to bottom. Use English letters, numbers and spaces.
      PRINT HELLO WORLDPrint the following text
      SET N 1Set a variable
      ADD N 1Add (SUB subtracts / MUL multiplies)
      PRINTVAR NPrint a variable
      GOTO 2Jump to card 2
      IF N LE 5 GOTO 2Conditional jump (EQ NE LT LE GT GE)
      REM MEMOComment
      ENDQuit
      Code: digits use one hole. A–I use row 12 plus 1–9, J–R use row 11 plus 1–9, and S–Z use row 0 plus 2–9. Maximum: 200 cards and 10,000 instructions. All charges are fictional.
      
  
      PUNCH CARD LAB
      A free browser lab for programming with 80-column, 12-row punch cards. All charges shown are fictional.
      © 2026 Karou / PUNCH CARD LAB