With this, I wasn't seeing any output with -display curses. It does work with -nographic or using a vnc connection to qemu's display, as well as on the two physical machines I currently have access to.
64kW of RAM @ a 4 byte (32-bit) word size, so 256KiB of actual RAM for the applications running on ilo.
For a reference, the 8088 build needs a bit more than that to account for stacks, the VM code, drivers, and memory needed for the actual hardware. (Around 384KiB physical RAM on an 8088/8086 works well from my testing, but I've tested with 285-320KiB in non-standard configurations under a few emulation targets).
For RetroForth, I have a new interface under development that may be somewhat like this. A screenshot can be seen at https://imgur.com/a/z4jhq6e
I use RetroForth as a working environment on Unix [mostly OpenBSD & FreeBSD], with an (unreleased) userland written in it, along with some use of external standard utilities. I'm still working on improvements around chaining programs via a pipe-like structure, but it's been my main environment apart from Konilo for a few years now.
I'm not well versed in qemu's various options. When I didn't specify a BIOS image, it seems to be using SeaBIOS, not UEFI, and hangs on "Booting from Hard Disk...". I should be able to start doing proper videos soon; I've been slowly working towards that.
I can say that the display & overall performance is noticeably faster on the two actual computers I tested on than under qemu on my Linux system.
Supernote hasn't posted anything about the potential future Linux system. I'm personally not expecting this to actually come around.
The standard OS is derived from Android, but has no Google Play services and only supports side loading (which works well via ADB; I've not tried other app stores like FDroid). It doesn't have a lot of standard Android things like a home screen/launcher, no notifications, and no UI for switching between apps other than using the sidebar to bring up the application list and going back that way. There are no speed modes for adjusting refresh rates.
IMO, it's a great eink notepad & sketch book, and makes a good ereader with something like koreader, but it's not good as an Android tablet.