First thing you are way better at this whole thing than I am as quoted by HANS
What it demonstrates is that in the hands of somebody who knows what he is doing and equipped with a lot of knowledge and experience, YES, it is easy. But to starters like Paul it isn't. Kai didn't you start small too?
that schematic is the only one of the core. there are however several schematics for other things i.e a schematic for adding NVRAM or EEPROM. You said the schematic is not complete so when you said I needed a more complete schematic. I made reference to one of the pages that envolved adding NVRAM or EEPROM. Again I don’t know what should be there. Now with your knowledge you know what should be part of the schematic better than me at no time did I say you should read the book and know what I want. As stated above I am new at this and don’t know what I need. You stated I'm sorry, I didn't want to discourage Paul. And I didn't want to make a talebearing. Not at all. Just the opposite. Ok, it's my job to make layouts nearly every day. And it's not my first layout arround 80C52 in combination with this '573 latch and CMOS RAM. So, it really took this little time to make this layout. This is why I want you’re your help! This statement was rude “I'm not the right person, if my only task is to provide you with a board, only because you want to save the costs for it.” It isn’t mater of cost. And this statement “4. You told, that additional circuitry could then be designed by the help of breadboards. By this you meant the paralleling of SRAMs etc. Well, this stands in total contradiction to what I stated in all of my last replys:” I said I would think if i later wanted to do more stuff i could expand by using a breadboard for other things. This ment for hooking up motors and sensors that kind of additional circuits. You know the things you connect to the input output thingys on a board. now I don’t know much about you. I would like to understand you better. You talk like I am a dog I don’t appreciate that. What would think if I degraded you for being too smart. and the next time you wonder why someone wants your input remember that you bragged about your abilitys.

paul