Found Paula chip (SMD version for A1200)

[d0pefish]

Zetr0:

The POTY line is indeed used for potentiometers, but is also used for Joystick Button 2, and the right mouse button. It is an analogue input - with the right mousebutton not pressed, ie, open, pin 34 of Paula sits at about 3V.

When the RMB is pressed, pin 36 gets pulled down to 0.18V-ish when I measured it. It does this on a second, working A1200 motherboard I have on me.

Mouse movement and left-clicks are working fine, implying that the 74LS166 shift register is functioning - only pins 1-4 of mouse port go to U34, and these pins are for directional movement. If you follow the path of pin 9 on the mouse port, (RMB) it passes through a resistor, a capacitor, then directly to pin 36 of Paula: (click to embiggen)



The fact that right clicks are heard as loud pops in the audio, and music playback is very distorted has me convinced there's internal damage to Paula.

More reference here:
http://amiga.serveftp.net/JumpyMouse.html

Anthony mentions "Note that the left mouse button (fire) signal on pin 6 of the D-range connectors is handled by one of the CIAs (U350 in the A4000D), while the right mouse button (fire 2 or paddle Y) on pin 9 is a 0-5V analogue input, handled directly by Paula (U400 in A4000D)."

Happy hacking!

 

[Zetr0]

@thread

Unfortunately there has been other issues that are unrelated to this thread and this transaction has been caught in the cross fire.

Its a shame that it has, but these things happen, I can only humbly ask that we let both Cosmos and d0pefish sort this out (I know that they will, they are both good members)

Even thought its difficult please let us try and refrain from direct negative comments as this wont make this situation any better.



@stevo-

hmmm next paypal I do I shall take some screenies of where the menu option is.

Paypal like to change their interface a lot - so I am not surpirsed its next to impossible to find.

---------- Post added at 13:24 ---------- Previous post was at 13:22 ----------

@d0pefish

thanks for the info!

its good that I learn somthing new every day!

 

[d0pefish]

@Zetr0:

No problem - there's every chance I could be wrong, but this is how the schematics and the multimeter are talking to me

As I've already said, I am happy to reimburse Cosmos if he says he has lost money over the refund, though I don't understand how that's happened. I have zero ill-feeling towards him, I'm just disappointed that he interpreted my mistake as intentional and I have lost my chance to fix my Amiga.

 

[d0pefish]

Still looking for the Paula. Would rather give the money to an AmiBay member than Vesalia, but hey-ho, can only ask for what people actually have.