Re: data *** / circuit diagram for Sun SCSI controllers.

* Me * wrote: 
Take a look at these two cards:

The SYM22810 (which looks identical to the Sun 375-0005 single ended 

board)

http://www.lsilogic.com/products/scsi_hbas/lsi22801.html

and the SYM22802 (which I assume is the same as the Sun 375-0006 HVD
board, although I can't verify this - can anyone??)
http://www.lsilogic.com/products/scsi_hbas/lsi22802.html



Dave,

I have a 375-0006 and a 375-0005 sitting on my shelf.  Is there anything
particular that you would like to know from them?

A quick look at the boards shows the same SYMBios chip part number ... with
the difference appearing to be the drive chips (transistors) interface to
the SCSI connections.

Let me know if there any anything you require and I will see what I can do
to help.  Note that I will be away from email for a couple of days.

Cheers




I'm interested basically in how similar the boards look. If the layout is very similar between the two boards, then it may be possible to lift some chips off of the HVD board, lift some chips off of the SE board and move them across.

It would need to be the chips that connect to the SCSI connectors. But if the Sun boards are like

http://www.lsilogic.com/products/scsi_hbas/lsi22801.html
http://www.lsilogic.com/products/scsi_hbas/lsi22802.html

then it looks impractical. They are too dissimilar.

Perhaps tomorrow I'll shut my U80 down and look inside to see if it is practical to connect a SE tape drive to one of the two SE controllers that are already on the U80's motherboard.

A DDS-3 tape drive was available as an internal option, and the machine has spare for a floppy as well as two internal 5.25" drives, so I assume you can fit floppy+CD+tape. But I can't see how - at least from memory, the connectors will not allow it.
--
Dave K

http://www.southminster-branch-line.org.uk/

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