commodore plus 4 power supply... big and heavy...

Hi,

I'm thinking to replace my big and heavy plus4 power supply....

I checked the schematics....

any idea of the use of the 9v unregulated ?  (indicated on the schematics)
and of 9v ac (I just found 9v ac on the user port...)

what happened if the 9v ac is not connected ?

any idea ?

any idea for a replacement of the power supply (switching power supply)...

thanks

--
didier


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