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MITS - 88-VI/RTC    Vector Interrupt/Real Time Clock Board
This is the best picture of this relatively rare board I could locate. 

     Clock3

The clock was really primitive.  The board was really a priority interrupt controller the clock/time function was obtained either from the S-100 bus 2MHz signal (pin 49) or the 60HZ from the power line. Time date etc had to be calculated in hardware.
 
The manual for this board can be obtained here
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This page was last modified on 01/22/2014