Только если недокументированно. Доки говорят только про *.

Current Memory Address
Another kind of label that's worth mentioning is the "*" (asterisk) character.

"*" gets replaced by the current memory address, like $0813 during expression evaluation.

Please note that the "*" character is also used in multiplications, so the assembler tries to determine the context where the "*" character is used in, and acts accordingly.

Кстати все забываю сообщить что в мобильном хроме не работает онлайн эмулятор на сайте картотеки