Welcome to Boardsort™ - Learn - Sell - Profit -

Please identify

Here's my guess:

Peripheral/Peripheral/Peripheral

CD-Rom Board

Peripheral

Peripheral

1: all appear to be backplanes
2: CD-ROM board (seen dozens of this exact board in my years of scrapping electronics).
3: Peripheral
4: Low Telco (good IC population with little junk on the board. Also believe this came out of a large managed switch.)

Lostinlodos?

Top photo.
I see the debate here:
The two small boards have high density pin population. But very little in gold weight.
The large one has lots of ports but only a few dozen small thin pins.
I’d say peripheral on all three.

kgryczan Is otherwise correct.
The switch has enough population to step up to low telco.

_________________
42 6F 61 72 64 73 6F 72 74 2E 63 6F 6D

Debate over backplane classing is ongoing. Even Chris/Boardsort has flip flopped over time on identical boards on what of the smaller low end boards will make backplane vs peripheral.
It’s a class almost entirely dependant on non-gold weight considerations.
And since few backplane have more than two ICs, if any, this is a very fluent consideration.
Anything beyond the most obvious rack and cube backplane will always ultimately be a ‘that day’ classing. Especially with risers, splitters, and adaptors.
12 months ago I would have said you should break the connectors off the two small ones for gold pin connectors over a midgrade board price. Today the boards are easily peripheral and we’re debating backplane class

_________________
42 6F 61 72 64 73 6F 72 74 2E 63 6F 6D