Without org'ing the dopes table to an address muiltiple of 256, which is what anyone using such a table would do, it is still simple - not guaranteeing this syntax though.
; call with string # (0-255) in acc
; returns dptr, acc trashed
CLR C
MOV DPTR,#dopes ; starting address
RLC A ; is >= 128 ?
JNC duh1 ; no
INC DPH ; yes, add 128*2 to dptr
duh1:
ADD A,DPL ; A = DPL + (index&127) * 2
MOD DPL,A
JNC duh2 ; if carry from dpl, add to dph
INC DPH
duh2: ; now have string address in dptr,
;call output string from @dptr subroutine