Re: help in muliprocessors
Maybe you don't need to synchronize both microcontrollers..
If you use Tri-state non-inverting buffers for address lines and 8-bit Tri-state non-inverting transceivers for the data bus you can connect both systems to one RAM.
What you need to do is to conncect 2 I/O lines between both 8085s and this will be your synchronization: if CPU1 asserts one of these lines LOW the CPU2 will have to wait before accessing RAM for as long as this line is LOW, and opposite way around, CPU asserts the second line LOW and CPU1 has to wait..