At last the component store didn`t find the flash ROMS. I`ve ordered programed to Zozo.

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Al final Merchan(Alcobendas) me estaban dando largas con las memorias y se las he encargado programadas a Zozo.

The Flash ROMs arrived just now.

I've checked one last time the changes before enter the chip in the socket....


And it works....... but the old EXOS inside the EP makes odd thing.


It's time to change it to the new version I have also received from Zozo.

From where of the main board I can take the required -WE signal?

From the expansion bus connector pin B2 (at the top, counting from the keyboard)

And, how I select the upper or lower 64k part of the 128K flash ROM? Directly 0v / 5v to the 2 pin(A16) of the chip?

Yes.
Or put a Pull-up resistor (10K) to pin 2 and pin 32, and wire from pin 2 and GND go to the switch. When the switch on then A16=0, when open the resistor make it to 1.

Changed the 5v to pin 31 of the internal ROM socket.
I added an A15 address to the pin 3 , directly from the pin 5 of the Z80.
Then 0v to pin 2  to test.

Power on, but the screen shows only moving strips of colours... 

Meanwhile I returned to insert the original ROM...

Of course, Nick pagination.... newbie error...

VCC disconnected from socket Pin 1 (Flash ROM pin 3)?

The EP without the Microteam EXDOS works good.

The problem isn't with the internal Flash ROM modifications.

(E)XOS reset or (N)ormal reset gives error with the card connected, but not with (A)dvanced reset nor (C)old reset:

Yes, the internal ROM works good, from the fist time, but I don't tested it without the EXDOS card until today....

The bad segments are: BF-B0, 9F-90, 3F-30 and 1F-10.

And if I extract the SRAMS, zero errors, but the 512k Flash ROM may have the same errors of addressing, isn't it Zozo?