This is the "wait for ready" screen.
So, the OS is waiting for the IDE/CF to become ready.
This takes 5 seconds maximum, after that it boots into memo-pad (if I remember correctly).
4.3I is ages ago for me....
Type something, if it appears on the screen it's in memopad.
remember to hold option to ENABLE basic.
Or, the partition you made as D1: has not been setup correctly.
Can you give a screenshot with FDISK loaded?
So I can see the partition information.
It's a bit of a chicken/egg problem here.
What I normally did, was creating a D2:, boot MyDOS over SIO, and write it to D2.
Re-enter FDISK, swap or change D2 to D1, save/exit.
Now you boot from IDE.
Set the correct drive-size with O.
Write DOS again to D1: to save this new configuration.
Setup completed.