PS, z, just so you don't get confused, comments should have been
amended for an 0400 example. Some of this this was clipped from
a program that had data at 0800 and I missed changing them

>          clrf   low_add    ;byte address within 0400 block
> d_loop   movlw  0x04       ;get data from table at 0x0400
>          movwf  pclath     ;set PC high to 0400 base
>          movf   low_add,w
>          call   table      ;fetch data into W

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