Hey there,
A couple of years ago I purchased a second hand ACA1221EC accelerator for my A1200.
The board seems to be working flawlessly, except maybe the RTC port.
I'm adding "maybe" since I'm using a (well known?) public domain RTC expansion plus a flat cable since it won't fit otherwise. The RTC expansion does work when installed on the dedicated ACA500 plus port though, even though it often won't be recognized at boot (it seems launching the ACA flash utility somehow "wakes it up" but I have no idea how this could be possibly related), despite being forced on the relevant setup page.
So the question is: how do I check if the ACA1221ec has an actually working RTC clock port? Could the flat cable (roughly 20cm long) be the issue preventing it from being recognized?
By the way when I checked the ACA1221ec board on the A500 (via ACA500plus) I forced the RTC to "A1200 accel."