The question "What are the differences in system support between the various HxC Floppy Emulator hardware options?" has three votes to close as "off-topic." (There's also one "too-broad" vote, which is arguably correct; this question is not about that.)
(There's also one "too-broad" vote, which is arguably correct; this question is not about that. I'm looking specifically for information on why this should/should not be voted "off-topic" specifically, not discussion about whether it could also be voted "too broad," as asking for a list answer (also "too broad") or any other reason to close it.)
Is this question off-topic, and if so, why? If it is off-topic, what kind of edits would need to be made to make it on-topic? (I.e., how drastically would the question have to be changed?)
Also, if it is off-topic, does that mean conceptually similar devices such as the SD2IEC are also off-topic?
The floppy emulator device itself is clearly modern and using modern components.
However, the question is about using it to replace historic peripherals on no-longer-manufactured computers built in the 70s and 80s. Further, the device itself uses an interface that the majority of modern computers no longer support. (The exception might be motherboards larger than Mini ITX, but even there most systems do not actually have a floppy attached, nor would one be likely to use a floppy or floppy emulator over a USB memory device.)
There's really no reason for this device (or any floppy emulator) to exist at all except to support pre-USB systems.
Looking at the on-topic page, I see the following things that might be applicable:
"Questions are most welcomed on... how to use or preserve computing equipment that is no longer manufactured or supported by the manufacturer." I would think that there's no question here that my primary purpose is to use various old computers.
"Questions regarding configuration of emulators on a modern computer may be better asked on Super User." Well, it's an emulator on modern hardware, though most people would consider the "computer" to be the device it's connected to.
"Questions regarding emulation on specific machines may be better asked on other Stack Exchange sites. For example: Raspberry Pi, Ask Different, etc." Since the emulation is being done on a modern microcontroller or FPGA, that would support asking on EE.
"Questions about electronics are off-topic unless they are confined to dedicated examples of existing circuitry of an existing and on-topic computer with the intention to understand its workings. For everything else, Electrical Engineering might be a good site."