HP 21MX Ethernet/SCSI card?

Hi Johannes, I see a Symbios Logic SCSI chip and the usual connector there so you've definitely got SCSI. What are those Zilog ICs? Any SCCs there? Or maybe just a little Z80 to run the card... That could provide further insight. What I don't see is any sort of Ethernet IC, nor do I see any of the usual accoutrements of a 10 Base-T PHY... not that you couldn't implement Ethernet in a PLD but I don't see what the design case would have been for that and even if that were the case, I still don't see any of the supporting discrete miscellanea (i.e. where's the DC-to-DC converter?) To know for sure, you can try to follow the traces on that 8-pin keystone jack and see where they go... if they land on a line driver or something, that's a pretty strong hint as to what it is. My guess is it's a SCSI card, perhaps with a little serial interface that you can hook a TTY up to to configure and manage the card, as was done on some Q-bus SCSI cards. Best, Sean On Tue, Feb 17, 2015 at 3:07 PM, Johannes Thelen <johannesthelen at hotmail.com