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Where's my mistake?

10 DISP DISP$;DATE$ @ A$=DISP$ @ DISP A$

EX: 1234 [RUN] ????

123420/09/16 Expected result

Thanks

I did not try running it, but the reference manual has the following cryptic statement:
"In general, characters displayed by a DISP statement are not readable [by DISP$]."
(Italics in the original)