Now you're confusing me. I thought these chips provided a USB-ATA interface. Here you're talking about ISA registers. But ISA is a motherboard architecture; it includes a lot more than just ATA. Does this mean that the chips essentially provide an entire motherboard at the far end of the USB link? Could you plug in an AT-style keyboard, for instance?
Yes, the USBAT chip seems quite a nifty one! You can connect ATA, EPP, and ISA devices to it. It's a pity that these things never really sold other than a few cd writers and CF readers - SCM have now dropped out of that market altogether...
Here's a description of the chip:
The shuttle USBAT-02 is a USB Function Interface ASIC providing easy integration of non-USB peripherals and peripheral controllers. The USBAT-02 is capable of attaching parallel port peripherals such as EPP scanners, IOMEGA ZIP drives and Shuttle parallel port peripherals. The USBAT-02 can also be configured to attach to direct ATA / ATAPI, ISA peripherals. Shuttle USBAT-02 is a single chip interface solution that requires no firmware or Micro Controller.
Don't ask me; I know zero about the HP8200. However the shuttle_usbat driver does seem to use packet commands, according to the comments in the source code.
Doesn't the fact that the flash version returns an error indicate that it really _isn't_ ATAPI? And doesn't your driver communicate with the flash device using regular ATA commands, not ATAPI packet commands?
Yes, these results certainly suggest this is the case. I had previously assumed that the flash devices were ATAPI since the compactflash spec says that CF devices are ATAPI-4 compliant. However now that I have a better idea about this, I guess its possible to be ATAPI-4 compliant and not implement packet commands.
Either way, at least we have a possible distinction. I think I have enough to work on now. I'll try and find a HP8200 user to confirm this will work. Thanks a lot for all your help :)
Daniel
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