C++ Programming: From Problem Analysis to Program Design
C++ Programming: From Problem Analysis to Program Design
8th Edition
ISBN: 9781337102087
Author: D. S. Malik
Publisher: Cengage Learning
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please help me modify this hack alu assembly code to display "CS 220" in the nand2tetris screen using the CPU Emulator, it is not working.. it only displays a small sliver of pixels at the top left corner // Built-in constant in Assembly

// @SCREEN // A=16384

// D=A

// Let's say we start at address 16640 (this is where our text will be placed)

@16640

D=A // D = 16640 (starting address for text)

@address

M=D // store starting address in 'address' variable

// Initialize count to 0 (start counting for 6 characters)

@count

M=0 // initialize the count to 0

(LOOP)

@6

D=A // D = 6 (total number of characters to print)

@count

D=M-D // D = count - 6

@ENDLOOP

D;JGE // if count >= 6, jump to ENDLOOP

// Place character 'C' (ASCII 67) at current address

@67

D=A // D = 67 (ASCII value for 'C')

@address

A=M // A = current address

M=D // Store 'C' at the current address

// Move to the next memory location (increment by 1)

@address

M=M+1 // Increment address by 1

// Place character 'S' (ASCII 83)

@83

D=A // D = 83 (ASCII value for 'S')

@address

A=M // A = current address

M=D // Store 'S' at the current address

// Move to the next memory location

@address

M=M+1 // Increment address by 1

// Place space character ' ' (ASCII 32)

@32

D=A // D = 32 (ASCII value for space)

@address

A=M // A = current address

M=D // Store space at the current address

// Move to the next memory location

@address

M=M+1 // Increment address by 1

// Place character '2' (ASCII 50)

@50

D=A // D = 50 (ASCII value for '2')

@address

A=M // A = current address

M=D // Store '2' at the current address

// Move to the next memory location

@address

M=M+1 // Increment address by 1

// Place another '2' (ASCII 50)

@50

D=A // D = 50 (ASCII value for '2')

@address

A=M // A = current address

M=D // Store '2' at the current address

// Move to the next memory location

@address

M=M+1 // Increment address by 1

// Place character '0' (ASCII 48)

@48

D=A // D = 48 (ASCII value for '0')

@address

A=M // A = current address

M=D // Store '0' at the current address

// End of program, prevent further operations

@END

0;JMP

(END)

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