https://bluescsi.com/docs/Usage
Something like this should work, emulating a CD-ROM on SCSI ID 3:
CD30_Apple_Legacy_Recovery.iso
Of note they list that Apple Legacy Software Recovery CD iso on Macintosh Garden in their doc on BlueSCSI images:
https://bluescsi.com/docs/BlueSCSI-Images
😟 I'm not sure if something like that would work. My guess is your 7.1 floppies are the upgrade version that work with Macs released before 7.1 came out.
You could overwrite the floppies if you have a way of doing that. Another old Mac, modern machine with floppy drive. I haven't really tried...
What are you using for your System 7.1 install source? I ask as 7.1 requires "System Enablers" to work on many systems (including the PB 165c) I would expect you'd see that error if you are using a 7.1 install source (floppies? images?) that includes a System Enabler for another model Mac.
Neat...
It looks like a 3rd party Apple TV Tuner card:
https://apple.fandom.com/wiki/Apple_TV_Tuner_Card
I had no idea that was a thing. I wonder if it accommodated some special/regional analog TV standard that Apple did not with their official cards?
Apparently NeXT machines had proprietary displays that included speakers, sound in/out, and the keyboard connection (ADB) for the computer. The Sound Box along with a Y cable let you use "standard" rebadged or 3rd party displays.
Good explanation here:
The cut corner PCB made me think of the MacSense E-440 NuBus Ethernet card
Macsense-440-NuBus-Network-Adapter
but the component layout is very different...
Apple has long held an iron grip on the materials and tools required to repair their devices but starting today I'm doing my small part to level the playing field by introducing a PowerBook Duo Battery Contact Alignment Tool rental service!
Never again wonder if your battery contacts have...
Alien = First movie to give me nightmares after watching on VHS (in ~1988 at age 11). The gritty realism made it connect at a level very different level from the Star Trek world I had grown to love, which didn’t go ”there”.
Aliens = OMG WTF was that! James Cameron’s epic bowled me and friends...
I just tried my BlueSCSI v2 external DB-25 with my Performa 6360 and it worked fine. Absolutely could be another issue uncovered by the above mentioned troubleshooting steps but are you sure you have v2?
I only ask because I was never able to get my BlueSCSI v1 external DB-25 to work with that...