Have a Solari Cifra 1210 (large, industrial, just HH:MM) - apparently functional (I can make hours and minutes advance using the buttons at the side). The main board operates from these buttons if you attach 3 D batteries to Vcc + GND pins at right edge, and +/-24vac to drive the motor (without the ac the buttons just beep and nothing moves).
The clock has two available connectors apart from the VCC+GND pins (presumably just for adhoc adjustment) and motors - a 2x5IDC ribbon on the main board, and the green 2-pin +/-24ac seen near top back of clockwork, from the 220v mains transformer. All the (1980s) chips and resistor arrays have proper data sheets downloadable from around the net. The MCU is NEC D7805C. The board supported Cifras with up to 5 motors, here only CH and CM are connected (hours and min); there are also connectors and darlington drivers for CMO,CDW,CDM: obviously month, day-of-week, and day-of-month.
Anyone have any tips on how to properly connect the 2-pin +/-24ac to the circuit board (there seems to be nowhere else for it go but the 2x5IDC)? I got the flaps working with pin 1 and 10 but fear that is incorrect and might have damaged it, though it worked to advance the hh/mm. If I can find a safe way to connect the 24vac, I can surely determine how to control from an arduino, presumably via 4.5V signals on the MCU pins INT0 and P50-2 - assuming I haven't already destroyed the chips.
I posted what I've been able to work out of the 2x5IDC pins using a multimeter. The motors seem to be unipolar with the two blue wires as center taps, connecting to pin 1 of IDC (which again seems to point to there being some sensible way to route the 24vac to the IDC without damaging the logic section).
Thanks for any tips!
