(Topic ID: 235895)

Rottendog MPUSEC ASIC chip orientation


By Brijam

4 months ago



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  • 10 posts
  • 6 Pinsiders participating
  • Latest reply 4 months ago by Pin_Guy
  • No one calls this topic a favorite

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PLCC (resized).jpg
pasted_image (resized).png

#1 4 months ago

Which way should the ASIC chip face on the Rottendog MPUSEC for the WPC-S? Pictures appreciated - the manual was non-existent on a new board and the Rottendog page for the board is DOA.

#2 4 months ago

Doesn't one corner have a notch to line up with a notch on the socket and board ?

LTG : )

#3 4 months ago

https://ksarcade.net/rottendog-mpu089-wpc-89-a-12742.html

Hover over the picture with mouse over ASIC. The dot should be on the right side if I recall correctly.

#4 4 months ago
Quoted from DumbAss:

https://ksarcade.net/rottendog-mpu089-wpc-89-a-12742.html
Hover over the picture with mouse over ASIC. The dot should be on the right side if I recall correctly.

Thanks!

#5 4 months ago
Quoted from LTG:

Doesn't one corner have a notch to line up with a notch on the socket and board ?
LTG : )

Not that I saw. Ordinary chips are obvious, maybe it's real subtle?

#6 4 months ago

ASIC chip has a dot on the top, the socket should have an arrow marking where it lines up.

#7 4 months ago
Quoted from Brijam:

Not that I saw. Ordinary chips are obvious, maybe it's real subtle?

It is subtle, 3 sides have pointed corners, the other has a flat corner. I don't believe it can be inserted wrong without pounding it in with a mallet.

The notched corner and socket key is shown here:

pasted_image (resized).png

#8 4 months ago
Quoted from Pin_Guy:

I don't believe it can be inserted wrong without pounding it in with a mallet.

Are you sure? Asking for a friend.

#9 4 months ago

PLCC's (this type of package for an integrated circuit) do have one chamfered corner to specifically orient the part when being inserted into a socket.
Can you insert it without a mallet? Well... probably. But you will be forcing it.

Look at this photo of another PLCC. Note the dot which denotes the pin 1 location (in middle of one side). To the left of the dot is always the chamfered corner.

PLCC (resized).jpg
#10 4 months ago
Quoted from Brijam:

Are you sure? Asking for a friend.

To quote Marisa Tomei as Mona-Lisa Vito in "My Cousin Vinny" ...
Im Positive.gif

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