What are the grades of these boards?

Thank you!

Peripheral: barely
Back side

Two dells are peripheral. The third board is a logic and I/O controller. It’s not good enough for hard drive so I’ll say high telco.

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The board that got high telecom came out of a tape drive. Why did the dell board get peripheral, when there was barely anything on it?

Thank you!

I figured that was an older SCSI tape board. Tape boards usually get CD/DVD board class. This one fits out differently. I still use an LTO 3 drive. The board there came from what was once a fairly high end drive. Lots of ram for buffering. All that memory pushes the class out of the CD category.

The low population dell board has massive gold pin connectors. It made peripheral based on the floppy drive controller rule. Lots of pins, no junk. ;)

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This drive controller board is.a good example for understanding a jump to high telco. Let’s look at what we have.
Two different connectors, two separate buses. Both have their own I/o controller.
We have ram for the input buffer. With it’s controller.
We have ram and a controller for an over flow buffer.
There’s an extra controller to handle the two buffer controllers.

All of this is beyond the base components of a standard drive board. This was an enterprise class drive. I don’t see a date off hand but I’d place it mid to late 2000s. The time frame of the mass shift from SCSI to SAS in enterprise equipment.

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Thank you!!!