Use a state machine

DMASTART1 DS 2000
DMASTOP1 DS 4
DMASTART2 DS 2000
DMASTOP2 DS 4

in initialize:
mov state,#0

start_pointer_list db HIGH DMASTART1,LOW DMASTART1,HIGH DMASTART2,LOW DMASTART2 ....


GetPointer: mov a,state
clr c
subb a,#MAX_STATE_VALUE
jnz StateIsGood
mov state,#0
StateIsGood:
mov a,state
movc a,@a+dptr
mov dph,a
inc state
mov a,state
movc a,@a+dptr
mov dpl,a
inc state

Have fun,

Erik