Changes

0-7 0-7

0-127 (not disc page) 1

The two ROM disable bits in the existing mode and ROM enable register disable the ROM as before, wherever it is mapped, as does the ROMDIS signal from the expansion bus.

The "write through" mechanism, whereby writes to an area which is currently mapped as ROM actually write to the underlying RAM, still functions, wherever the ROM is mapped. However the write through mechanism cannot be used to access the register page. Write through also does not operate to the RAM from the register page.

===Analogue paddle ports===