Hi,
an extension to the question...I am using 89C51 of Atmel and Philips. I am connecting the following to the chips...
1. 4 Chips (controllers) connected to one master chip.
2. ADC0800 (2 nos) to one controller
3. DAC0800 to another controller
4. 8255 to another controller (and the 8255) accepts Digital Inputs Only.
So, for which controllers am I supposed to use Pull-Up/Pull Down resistors? If required, I can send you the detailed drawing of my system. Yeah, I know so many controllers are not required and you can simply extend the bus and address lines, but this just happens to be the case.
Regards,
Sriharsha