Stephen Hoffman
Now with 16kSuccess: The Beginning - Reading Seconds from a Dallas RTC #DS12887+ on a #ZX81 / #Minstrel3. Note: I'm using the ZXIO V2 Interface card, which accesses the RTC via an 82C55A.
@pfriedma If that Sun has the same Dallas #DS12887 used on some DEC gear:
https://www.tindie.com/products/glitchwrks/gw-12887-1-dallas-ds12887-rtc-replacement-module/