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AQA Assembly Challenges

Challenge

Scenario

Syntax rules enforced strictly: labels must end with : and be on their own unindented line; instruction lines must be indented; immediate values must use decimal #; only registers R0..R12; memory refs are decimal addresses 100..199. Registers and memory cells are implemented internally as 16-bit signed integers, so values outside -32768..32767 overflow and wrap.

Ready.

PC: 0

CMP Flag: N/A

State: Stopped

Registers (R0-R12)

View registers in binary

Memory 100-199 (10x10)

Instruction set

Instruction	Description

Labels

A label is placed in the code by writing an identifier followed by a colon (:). To refer to a label, place the label identifier after the branch instruction.

Interpretation of <operand2>

# — use the decimal value specified after the # (for example, #25 means decimal value 25).
Rm — use the value stored in register m (for example, R6 means use the value stored in register 6).

The available general purpose registers that the programmer can use are numbered 0 to 12.