Kai,

I am not sure about the Bus contention that will happen when /RD goes low. I am assuming that when /RD goes low, data from Board-2 (IO Board) will be put on the data bus by U14.

If this might create problems, can you please suggest another Bus buffer IC that might do the work ? I am actually using U14 as a buffer, since the 8052 datasheets specify the use of only 4 ICs on the P0 port. Hence, to interface the rest of the ICs, i was using U14 as a buffer.

Can you suggest any other bi-directional buffer, which might not need the Direction control with /RD line ?

I suppose a 74HC244 will be adequate to buffer /RD, /WR, A0 and A1 lines ?

Well, i am using a MN1380 Supervisory and Reset IC. Can change to MAX part, no prob.

Thanks.