I'm not sure what specific relevance MrAtari, MYIDE-II or MYBIOS have to the 1088XEL project at all. No offence to either, of course, but MYBIOS is not part of the 1088XEL firmware. One may flash any OS to the U1MB OS slots, of course (MYBIOS included), but to acknowledge them all (Q-Meg, for example, which is supplied in one of the default OS slots) would be a lengthy and pointless exercise. Likewise one may plug in an Ultimate Cart, UNO Cart, etc, all of which are equally useful.
The stuff about 32MB partitions still requires correction; as I wrote previously, only the available filesystem imposes any limitation on size (aside from the limitation imposed by 28-bit LBA addressing). So really it would be appropriate to say that most available file systems - owing to 16-bit cluster addressing - are limited to 16MB partitions, while SDX can address 32MB partitions by virtue of the fact that it's the only currently available DOS capable of using 512 byte sectors. Using FATFS.SYS, even that limitation is removed (since clusters may typically be 4KB in size).
Likewise the 15 drive limit is really a software limitation. If SpartaDOS X - for example - chose to use more than four bits for the device ID, we could have 26 or 100 or 256 hard disk partitions mounted and addressable simultaneously.
The other salient point - which may already have been observed - is that SDX is not a requirement for the use of FDISK, etc. Most of the APT tools may be used with MYDOS, etc, if the user so desires.
Edited by flashjazzcat, Tue Aug 7, 2018 4:49 AM.