I did some firmware upgrade, systematically checked all possible jumper positions and got the concept now. I really can emulate two drives with two different image-files now (what they call "indexed mode"). Also with my Rev. C emulator board.
I can boot FLEX on disk 0 (DSKA0000.HFE), but FLEX does NOT recognize CHATPLUS_DSK.HFE (DSKB0000.HFE). I think the HxC converter program is not working right for that file. The FLEX-extension ".dsk" is used by many systems, it's not unique.
FLEX disks have a specialty:
Track 0 starts with sector 0 (directory), has no sector 1, goes on with sector 2,3 ... 9.
Tracks 1 to 39 start with sector 1 and go on regularly up to 9.
The hexdump of the "chatplus.dsk" file shows no disk geometry information at all, just user-data. In consequence the HxC converter program generates a standard disk with 40 tracks, sectors 1 to 9 each. Now when FLEX is looking for tr.0/sect.0 to read the directory, it can not find a sector 0. The disk is not valid.
As far as I understand, I can't simply rename tr.0/sect.1 to tr.0/sect.0 in the .hfe-file, since that format represents a pseudo-analog recording of the complete tracks, including the inter-sector information, like a sampled, sequential stream, with 2 to 3 sample values per magnetic bubble on the disk. I would have to do this with the help of some tools or better the floppy controller, which surely is possible, but I don't have a solution ready, at the moment. I'm not sure, if that format should be suggested on the HxC-website for future supplement, since there probably are no more than ten people on planet Earth, who really are using that.
![Confused :?](./images/smilies/icon_e_confused.gif)