Hi Ralph, Ralph Little writes:
> Hi, > > On 2020-05-18 4:48 a.m., Olaf Meeuwissen wrote: >> >>>>>> If so, what is the likelihood that epson2 would work with this >>>>>> scanner with moderate modifications? >> None. The non-free interpreter is dlopen()ed by the epkowa backend and >> it converts the regular ESC/I protocol to the device's native protocol, >> insofar possible. Mind you, there are *several* such native protocols. >> These native protocol are not even remotely close to the ESC/I protocol. >> You'd be better of trying to find a backend that uses something close. >> For a few of the interpreter using devices, the snapscan backend is a >> good match. For others, I don't know. Maybe sane-find-scanner can be >> of help to check whether it's something genesys-like, I don't know. >> >> While porting those interpreters at part of my work duties, I have >> tended not to look at the closed source more than absolutely needed to >> get them to compile and "work". That was about a decade (or more) ago >> so I don't have any recollection anyway beyond what found its way into >> epkowa.desc :-P >> > Do we have any documentation regarding the ESC/I protocol? Yes. Lots. At one point EPSON provided the protocol specs for a number of their scanners for download to developers. The download terms were such that these documents cannot be made available to other folks but I have a bunch of dead-tree versions. I used those to implement something called [FreeRISCI][1] and added API documentation to it based on the implementation to work around the "NDA" for the documents. I contacted EPSON at the time to check it that would be okay. I don't remember the exact reply but it was something like "it is not not okay". The [Utushi][2] code actually incorporated much of the FreeRISCI code to add ESC/I support so you can find the documentation there as well. [1]: https://launchpad.net/freerisci [2]: https://gitlab.com/utsushi/utsushi There should be `doc` or `doxygen` `make` targets that produce HTML if you wish but it's all there in the C++ source code. Actually, the Utsushi code also documents a fair deal of the ESC/I-2 protocol IIRC. Hope this helps, -- Olaf Meeuwissen, LPIC-2 FSF Associate Member since 2004-01-27 GnuPG key: F84A2DD9/B3C0 2F47 EA19 64F4 9F13 F43E B8A4 A88A F84A 2DD9 Support Free Software https://my.fsf.org/donate Join the Free Software Foundation https://my.fsf.org/join
