Posted By
weidi
on 2021-12-21
10:33:32
|  Re: Cartridge port Not working correctly
I'm out of ideas.
Something must be wrong unless your Plus/4 generates voltage by itself 
Either your power connector or multmeter has something wrong.
On my Plus/4 U20 pin 4,5,6,7 +4.62V; 9,10,11 +4.65V only pin12 has +1.98V (computer idle on welcome screen) .
I have no higher voltage than Vcc (in my case +5.18V), but I'm using small 15W 5V impulse power supply from old wifi router. U2 pin 39 - +4.87V
I connect only Pin5,4 for +5v pin1,2 and 3 for GND on round C64 style power connector. No ~9VAC at all.
This is for mother board Assy No.310163, where power socket conversion is easy (solder out-solder in).
I know there are older or other mother board for example Assy No 250455 where such a conversion is not easy.
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