The 28pin '''Smart Watch''' (DS1216) is an adapter that can inserted in standard ROM sockets, a ROM chip can be mounted on the adapter, finally, inside of the adapter is a 16pin '''Phantom Time Chip''' (DS1315). Normal memory reads are forwarded to the piggyback ROM. After reading from a specific sequence of addresses, the ROM is disabled, and data is instead read from the Phantom Chip via 1bit databus. Writing to the Phantom Chip is done by reading from a specific sequence of addresses, too.
* [[Media:DS1216-smart-watch.pdf]] - Dallas Datasheet for '''28pin Dallas Smart WatchAdapter'''* [[Media:DS1315-phantom-time-chip.pdf]] - Dallas Datasheet for '''16pin Dallas Phantom Time Chip'''* [[Media:DS1216-app-note-52.pdf]] - Dallas Application Note on Smart Watch and Phantom Time Chip
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