currently, I am checking a long stored Mega 2 machine. It has a button on the back and inside I found this little add on glued on one of the chips (well the glue is gone, so I lay it on the side for the photo). It is this white "board" with the black box attached and some "transistor"-whatever sticking out. It is connected to the button on the right (back of case) and has a little round battery it seems. The white cable leads to the modem port and the PSU, green and blue cables lead to the PSU as well and the black and red cable lead to the fan. The fan appears much more noisy to me than on another Mega ST I tried (Mega ST 1 in that case). So it might be just to turn the fan on and off? Any ideas?
I could not detect any changes of the fan or TOS version or any other reactions when switching and well, if this is a battery it would be empty anyway. It would be good to know if I should remove it or the battery or try to exchange it.
Also, this machine has issues running software from disk, e.g. TOS errors or just stopping after a bit of loading demos and things like that. Maybe some chips are loose, I will try to press them gently and hope this helps. This action definitive fixed another Mega ST 1 machine earlier this year.
Anyway, would be nice what this little button is supposed to do and if I should care about this device, maybe its the source of errors. Any hints are appreciated!
Thanks and Greetings!