Hi Erik,

1.
The latch is driving 3 pins..
p2.0,p2.1,p2.2...i have connected these lines to latch(74hc573)..
so i am controlling the higher address (like last 3 bits)by that latch and remaining address controlled by the DPTR ..

2.there is no instrucation like movx @DPTR,#

but the code is like this

mov a,#02h
mov dptr,#1234h
movx @dptr,a

that is the code..

3. yes, micon means microcontroller only.

4. 89C51 is the microcontroller part no..

5.clock speed is the 11.059Hz..

6.memory chips are FULL type.(SRAM DS1250AB).

these are the answers of your questios..

ragards
-srinivas.