Nand to Tetris Chapter 4: Terminating Programs Pseudocode

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What does the 'D;JNE' instruction do in Hack assembly language?

Jumps if D < 0

Jumps if D > 0

Jumps if D = 0

Jumps if D ≠ 0 (correct)

In the context of branching instructions, what does 'D;JGE' mean?

Jump if D < 0

Jump if D = 0

Jump if D ≥ 0 (correct)

Jump if D > 0

What is the purpose of the 'D;JEQ' instruction in Hack assembly language?

To jump if D > 0

To jump if D = 0 (correct)

To jump if D ≤ 0

To jump if D < 0

What does the instruction 'D;JLE' do in the context of typical branching instructions in Hack assembly language?

Jumps if D ≤ 0 Signup and view all the answers

If we encounter '@ constant (A ← constant)', what does this signify in Hack assembly language?

(A ← constant) sets A register to the constant value Signup and view all the answers

Which register is used as a data register in the Hack instructions mentioned?

A Signup and view all the answers

In the Hack instructions, what does the command 'D=D+A' signify?

Assign the sum of D and A to D Signup and view all the answers

What is the purpose of the '@ constant' instruction in the Hack assembly language?

Assign a constant value to register A Signup and view all the answers

Which instruction is used to assign the value of 1 to register D in the Hack instructions?

D=1 Signup and view all the answers

What does the instruction 'M=M-D' do in the context of Hack assembly language?

Subtracts the values stored in registers M and D Signup and view all the answers

In Hack instructions, what does 'A ← constant' signify?

Set register A equal to a constant value Signup and view all the answers

What is the base address of the screen memory map in the Hack computer?

16384 Signup and view all the answers

How many memory blocks are used for the screen memory map in the Hack computer?

16 Signup and view all the answers

In the screen memory map, what data is represented by '1000000000000000'?

White display unit Signup and view all the answers

How many bits are used to render output in the screen memory map of the Hack computer?

8 bits Signup and view all the answers

What does the 'refresh' operation do in the screen memory map?

Updates the display with new information Signup and view all the answers

In the screen memory map, what does '0000000010101111' represent?

'Physical screen' Signup and view all the answers

What does the pseudocode do if R0 is greater than or equal to 0?

Sets R1 to 1 Signup and view all the answers

In the provided pseudocode, what happens when R0 is less than 0?

R1 is set to -1 Signup and view all the answers

What is the purpose of the 'POS' label in the pseudocode?

Provide a jump target Signup and view all the answers

What would happen in the pseudocode if the condition 'R0 ≥ 0' is false?

R1 is set to -1 Signup and view all the answers

Why is it recommended to terminate every assembly program with an infinite loop?

To ensure the program keeps running indefinitely Signup and view all the answers

'D;JGE' in the pseudocode represents what operation?

'D' is jumped if greater than or equal to 0 Signup and view all the answers

What is the purpose of the given example in the context of pointer-based processing RAM?

Set the first n words of the memory block beginning in the address base to -1 Signup and view all the answers

In the given example, what does R0 represent?

The base address of the memory block Signup and view all the answers

What is the significance of R1 in the context of the provided example?

Number of consecutive words to be processed Signup and view all the answers

How many total words are being set to -1 in the memory block in the given example?

5 Signup and view all the answers

Which register range is utilized for storing the values to be set in the memory block?

R2...R15 Signup and view all the answers

What happens if R0 in the example points to an invalid memory address?

An error occurs and the operation fails Signup and view all the answers