I can now make copies of the Indus "doubler" boot floppy for standard Indus drives (the ramcharger is not needed).
Currently the only way I can make these is with a Indus drive with ramcharger, a CPM bootable floppy with a debugger and the init program. The init program copies the boot sectors, but it reads the boot sectors before any user prompts. By using the debugger, I can load the init program, switch to the "doubler" boot floppy, then start the init program running from within the debugger, in which case it reads the "doubler" boot sectors, and then prompts the user to switch to the destination floppy, optionally format the destination floppy and then copy the boot sectors. It also initializes the CP/M directory to empty, which is unneeded in this case, but doesn't cause any problems.
I'd like to mail a copy of a "doubler" floppy disk to someone here who has some way of doing an image backup of this floppy or whatever tools the community uses here for this type of stuff.
From what I recall, one of the local retailers back in the 1980's was giving away the Indus "doubler" for free to customers that purchased an Indus drive. I wasn't aware at the time of how rare it was.
Edited by rcgldr, Fri Jun 8, 2018 11:23 PM.