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Intersystems IA-3080 Real Time Clock Board Card.

This was a very simple board Intersystems made for their S-100 systems Real Time Clock (RET). It also doubled as a bus signal termination board.

RTC Board

The IA3080 utilized a MM58167N clock chip to retain time and date information for the system. It had  a trimmer cap to allow the time to be accurate to within a few seconds a month.  There was a large battery for power backup on board.  Unfortunately the board required 32 consecutive assress ports on the bus. A much better solution was the ability to locally select the clock ports for example see the SD Systems IO/RTC board.

A manual and diagram for the board was reversed engineered and can be found here.


Other InterSystems S-100 Boards
64K Dynamic RAM    8K RAM   EPROM   IA-Display   FDC   IO-Card    Z80-Series-II    Z80
    ADDA Board   EPROM Burner
FPB   256K Dynamic RAM   16-64K EPROM
  HDA   Z80-Series_III   6-SIO  EPROM Emulator  RTC Board



This page was last modified on 10/25/2013