Using KS3.1 from AmigaKit. It won't "completely" boot (as described above) from floppy with Ralph's 4.15 Binddrivers (gvpscsi.device / gvpscsi.info) installed in the expansion directory of an OS3.9 Emergency Boot Disk and the GVP ROM is disabled. The computer, when the the GVP ROM is enabled, will boot from the same floppy (I assume because it's not using the binddrivers but rather the drivers provided by the ROM??) This is the point I want to confirm, can I have a v3.12 ROM in the GVP, disable it, but boot from a floppy with v4.15 binddrivers. Forget the PCD-50B for now.. just trying to get the 4.15 firmware/drivers to work the the GVP Combo card.
Maybe they switch it back for 3.5 and 3.9, but AFAIK from KS 2 onwards, you have to put devices in devs drawer the your boot disk, not expansion drawer. That was for KS and Workbench 1.3, for adding hardware.
If PATH has been added for Expansion drawer, I would guess binddrivers would find the device anyway (it would search every PATH'd directory for all .device files). But if the gvpscis.device is in the wrong drawer and binddrivers can't find it, that would be an issue.
Isnt there a handler file as well that has to go in L drawer of boot disk? I don't seem to recall one for GVP hard disks. Again, more of a old school hard drive problem rather than the later ones, GVP much more plug and play.