Malte Struebert wrote:
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#1 Q: Is it right that in this configuration the internal ROM is completly hided

If the EA pin is asserted, yes.
#2 Q: How can i see in the asm. sourcecode on what type of RAM/ROM the MPU accesses?
Look in the source for MOVX and MOVC. Thats all you can see regarding RAM/ROM access. The rest you have to deduce.
#3 Q: Is there a memory map i.e. from adr. x to adr. y = External EPROM and from adr. a to adr. b is External RAM and so on?

You can create one, if you can drive the system bus with another processor, and have a logic analyser. Or, if you are lucky, they use port pins as CS lines.

#4 Q: Is it possible to access external and internal RAM when an external RAM is connected or is it like the program ROM, that if you connect an external ROM the internal ROM is disabled and hided?

Yes, internal RAM is accessible always, unless you use it for stack, in which case it stays accessible, but you will pay the consequences of using it if the stack gets there first.....

Steve