Help identifying the upgrades on a Falcon.

[Caribeno]

Hello!

I'm finally the owner of a Falcon, and I'm very happy. The first impression is that the machine is working, so that's nice. But when I opened it, I found 2 upgrades that I cannot identify:

 

First one, I think, it is a buffer patch. It has wires going to the floppy controller (pin 14) and to the motherboard.

 

Second one, has wires connected to both EF68B50P ICs (pins 3, 4 and 5) and other places in the motherboard. It has some oscillators, so... It is some kind of overclocking? The strange thing is that there are other cables coming from the little board, but they are cut. And, of course, there is the fact the fan was removed to put this little board.

 

Any clues?

 

Thanks,

 

Andres.  

[TGB1718]

11 hours ago, Caribeno said:

First one, I think, it is a buffer patch. It has wires going to the floppy controller (pin 14) and to the motherboard.

A few more photo's of the points where the wire go might help identify, are you sure it's pin 14 ? I believe that's GND (0V) on the chip

The circuit itself is purely a buffer, using a 7404 hex Inverter.

 

Sorry, no idea on the second circuit

[snarkdluG]

He got answered on other forum that it is a nemesis bus speeder. Just to let you know.

 

 

[Caribeno]

44 minutes ago, snarkdluG said:

He got answered on other forum that it is a nemesis bus speeder. Just to let you know.

 

 

Yes, thanks @snarkdluG . Both boards are part of the Nemesis upgrade.