The utils I have are very similar to the Happy 7.0/7.10 disks, save the menu has an orange background colour. I think there are between 6 & 8 menu items, e.g. sector copier, diagnostics, Lazer backup etc., but I can't remember the others. I think there might have been a hacked Happy Backup disk floating around, but I'm not sure. I am sure that the read/write files to a 180K IBM PC-disk utility worked fine, as that was my only way to transfer files for a long time. I think the Happy PDB files worked fine with it too, and there can't have been too many differences between it and a Happy drive as I could dump the Laser ROM using code from the articles in Atari Magazin.
I also remember that there was a bug in Lazer mode where you could corrupt disks when running SpartaDos, so I am guessing there must be a lot of shared code with the Happy, as there was a similar bug with Happy drives (iirc).
I think my laser/Doubler is a little different from yours, I have either a single large EPROM, and the switch toggles the address line to select a bank of code, or I have 2 identical stacked eproms, and the switch toggles between them somehow.
I'll upload the disk image as soon as I can, it would be good to preserve it, and it is probably quite easy to make a protected version using the archiver editor, then someone with a Kryoflux can write out the ATX (I guess).
I think Nezgar found some info on this mod on pigwa, but I don't have the link handy - I think it was posted on one of the earlier threads.
Hope this helps!
Edited by E474, Wed Apr 24, 2019 2:00 PM.