Changes
/* Dallas Semiconductors Smart Watch */
'''Forward: Whether or not the Dobbertin Smart Watch does actually contain chipset from Dallas Semiconductors is still unknown... The term "Smart Watch" and the technique of inserting the RTC into a ROM socket does indicate that the Dobbertin RTC has some relation to the Dallas product... It might be exactly that hardware, or similar compatible or incompatible hardware, or something entirely different... can somebody verify which chip(s) are used in the Dobbertin RTC ?'''
The 28pin '''Smart Watch''' (DS1216) is an adapter that can inserted in standard ROM sockets, a ROM chip can be mounted piggyback 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 addressaddresses, too.
* [[Media:DS1216-smart-watch.pdf]] - Datasheet for 28pin Dallas Smart Watch
