So i am an avid collector of older computers and of course many of them come with dinosaur real time clocks installed. I have thought maybe it's possible to simulate an older real time clock module for pinout configuration so that a Arduino could be used in place of the old RTC chip.
I know RTC's rely heavily on a very calibrated crystal to keep accurate time. I was wondering if I could use a new RTC module for the Arduino with battery backup to keep accurate time, but declare the cert pins on the Arduino to be used as the original RTC module like the 5 address lines, 8 data lines, Write enabled, etc..
If so, then a small PCB can be created to plug the arduino onto and that PCB can be plugged in place of the vintage RTC chip. Boot code would access the arduino RTC to get the time and date as normal. The vintage computer would use its programmed logic to access the arduino simulated RTC through the declared pins.
Anyone have any experience with such a project or even think this is possible?