6309 xIM indirect addressing not understood

[mjwurtz]

A09 doesn't understand instructions like
AIM #$55,[4,X]
or AIM #$55,[,X]
It complains with
error 2: Illegal addressing mode in " AIM #$55,[,X]"

On the other hand, non indirect instructions are working :
AIM #$55,4,X
or
AIM $#55,,X

[electrickery]

Another syntax does work:

 E03E 623F44                  AIM    #$3F,4,U         ; Direct DP-page
 E041 027F23                  AIM    #$7F,<$0123      ; Indexed
 E044 6210C820                AIM    #$10,$20,U       ; Extended

Too bad all the documentation on the 6309 extra instructions are very sparse on examples. I found this syntax by putting the opcodes in a 6309 disassembler.

Fred Jan