Index Modification Writes to System Device

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This error occurs in Basic model QCPU, High Performance model QCPU, Process CPU, and Redundant CPU when data, after being modified by an index register, attempts to write to a device reserved for system use. While device range checks aren't always conducted, writing to a system device specifically triggers this error, indicating a critical memory access violation and potential system instability.

• Program logic using indexing (e.g., X10Z0) results in an address pointing to a system-reserved device range.
• An indexed write operation bypasses standard device range checks and targets a protected system memory area.
• Improper calculation of indexed addresses leads to an unintended memory overwrite.

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1. 1

   Review the program logic where index registers (e.g., Z0) are used in conjunction with write instructions.

2. 2

   Carefully calculate the maximum possible address that an indexed instruction can access in a given program segment.

3. 3

   Adjust device assignments or limit the range of index registers to prevent access to system-reserved device ranges.

4. 4

   Verify the CPU type and its specific handling of device range checks during indexed operations.