Modern CNC controllers are forgiving; older ones are not. A missing decimal point, an unexpected character (like a space where there shouldn’t be one), or an illegal address (e.g., Z. instead of Z0) can cause the parser to fail. The “cannot be read better” message often appears right after a syntax error in line N510 or near the TNS510 block.
Many retrofit companies offer flash memory or SD card adapters that emulate bubble memory. These are far less prone to “cannot be read” errors. tns510 program cannot be read better
Miller let out a long breath. "I'll be damned. It read it." Modern CNC controllers are forgiving; older ones are not