accidentally I discovered if you delete the line that contains the MAC ADDRESS from the eeprom, the network is not initialized, and in this way the network chip can be removed without generating any problems at startup, connecting the CE2 pin of the bios to the gnd of the ROM1 not is loaded...
pins removed from the DSP and the console still works, there was a bus to MECHACOM and another to the EE, but somehow the buses are interconnected internally, as we have the magic gate, information from the MECHACOM eeprom, etc...