In my growing CRT collection, (I have a problem, it gets worse by the day).
I have some multisync monitors and this smaller monitor it's a Toei FTC 1208 with an 8 Pin interface usually used for Digital RGB (CGA, EGA, NEC PC8801 etc).
It's a 0.28mm dot pitch, high contrast, beautiful thing from 1985!

On my multisync monitors this 8 pin interface is labelled as "Digital RGB".
On the montior in question (24KHz only native) it is labelled as "Video Input".
On the lower model Toei FTC 1203 it has the same port and switch for analogue and digital. (Like some Commodore monitors) There is no input switch on the FTC 1208 that I have, just intensity toggle for digital.

This is the port (the MSX pinout shown is different to normal use cases).

My question is - if it succesfully displays the same signal (see below) albeit not quite in sync with an analogue source and a TTL digital source, does that mean it is compatible with both signals?

I would expect a digital only capable input to show a blank/garbage or solid colour screen when receiving an analogue signal.
The Toei does this for as second when fed an analogue input and then changes to normal and you can make out some text and graphics, so maybe it has a sensing capability?

More details:

I have tested it a bit using a Tseng ET4000 ISA Card with both 15pin analogue and 9pin digital outputs.
Both outputs produce the same image on the monitor, I can make out the bios image and Windows at 640x350.
Sadly it can't quite sync properly so far, even when the Tseng is set to EGA - it's a Japanese monitor and expecting 600x400@60.

I'm hoping to get one of the machines it's designed for later on and a downscaler capable of the precise 24KHz it expects for other sources.
NVIDIA custom resolutions has failed me so far being buggy at any really low resolution.
It would double up as an awesome scaled DOS, 8bit computer monitor and a shmup tate CRT if it can take analogue RGB. (don't hate me 😀)