Hi, I've build a small board with a Siemens 80c535, an EPROM and a RAM-module. I want my EPROM from 0x0000 -> 0x7FFF and my RAM from 0x8000 -> 0xFFFF. I use A15 as chipselect, with an inverter to the RAM, and directly to the EPROM's /CE. I've tried putting it all together, and load the EPROM with MON51, but when i try to connect from Keil (using debug), it seems to work a little, but it keeps saying BAD SERIAL TRANSMISSION in the status window. Although, it also writes Connected to Monitor ver. 3.0... Spookey :) Any ideas? -Steffen
You need to negative OR !PSEN and !RD. Erik