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.
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
FPB
256K Dynamic RAM
16-64K EPROM
HDA
Z80-Series_III
6-SIO
EPROM Emulator
RTC Board
This page was last modified
on 01/08/2011