XBUS RTC - Real Time Clock
Of course can't a seriusly 8080 be without a RTC, so I had to make one.
This was my first version, oddly named 1.1, but once again I fell on the parallel interfacing an ATmega processor to the 8080.
Version 101 uses a ATmega328P to "talk" to the clock ship using I2C and where intended to simplify it all for the 8080 by exposing a simpel parallel interface.
Version 2.0 instead uses an Epson RTC-72421 chip that are parallel, making a child play to interface
to the 8080. So far I haven't got time to test it, but it's there on the table, waiting.
Not shown here are the 64 pin XBUS connector.
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