>>>>> "j" == jbevren <firstname.lastname@example.org> writes: j> Since the machine starts from a game rom, I/O will be mapped in. j> Once the SCPU gets permission to start, it locks DMA mode j> permanently, with I/O enabled, and mirrors key locations to the c64 j> upon write, I.E. Dxxx, 0, 1. j> The entire contents of RAM are also mirrored at an unknown (to me) j> interval unless you select an optimisation mode, but that's beyond j> our scope. ;) RAM is mirrored at every write cycle if you don't enable optimisation. I don't think it keeps the C64 in the game rom state though -- it's possible to write to the memory underneat the I/O area. There's certainly a lot of magic in the SCPU. -- ___ . . . . . + . . o _|___|_ + . + . + . . Per Olofsson, konstnär o-o . . . o + MagerValp@cling.gu.se - + + . http://www.cling.gu.se/~cl3polof/ - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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