Calling All Macintosh Plus Owners I Need Your Assistance.

[jajan547]

Hello everyone I think I may have stumbled upon something special, I suspect something odd on a machine I picked up (Macintosh Plus Rev C Board). If you all could post a photo near the reset and interrupt switches on your boards this would help a lot! This can be any revision but C definitely helps. Thank You.

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[joshc]

Got a pic of what you think is unusual on yours?

 

[bibilit]

Rev C board

 

[jajan547]

Very interesting some C boards have markings there

 

[LaPorta]

What exactly are we looking for?

 

[jajan547]

Thought this was strange but guess not

 

[rollmastr]

This is the logic board out of a late Mac Plus that was built in 1990. I had to replace the ROMs to get it working.