DEFINE WRITE_INT 1 is used to avoid write errors during a WRITE to EEPROM which might otherwise possibly be caused by an interrupt occurring during the write. The functionality is that it disables interrupts just prior to executing a WRITE instruction, and re-enabls interrupts after the WRITE completes. Appears to be strictly a PBP3 feature.
With regard to the "DEFINE WRITE_INT 1" directive, it appears to be available at least from PBP 2.50 onwards. I misspoke above^^^. Apologies.
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