hi jose;
why not do this:
;assume stepper motor codes are in code memory from z to z+7
;function motor_out receives parameters in acc and b.
;b contains motor number(0 to 7)
;acc contains code offset(0 to 7)
;stepper motors are mapped in PDATA from 0
;to 7 in stepper_page
motor_out:
mov r0,b
mov p2,#stepper_page
mov dptr,#z
movc a,@a+dptr
movx @r0,a
ret
this simply outs the code.you can call
delays for speed,pass offsets in steps of 1/2 to issue half.full step,call them in inceasing/decreasing order for direction.

regards
pranav