You need an address latch, it holds the lower 8 bits of the address, and is latched by the ALE signal. An LS573 is a good choice for standard 8052s.

AD0-AD7 goto to the latch, A0-7 come from the latch.

ADO-AD7 goto the data pins of the EPROM. The lower 8 bits of the address come from A0-A7. The upper 5 bits of the address come from the lower 5 bits of P2. The CS line can be tied low. PSEN of the CPU goes to the OE pin on the EPROM

Steve