This is the font used in my Scratch projects that use SSEGA OS, SSEGA OS 92, and SSEGA OS CD (https://scratch.mit.edu/projects/938150503/ https://scratch.mit.edu/projects/938615942/ https://scratch.mit.edu/projects/939136020/). It has a lot of characters in a 4x5 bounding box.
1:1 2:2 3:3 4:4 5:5 6:6 7:7 8:8 9:9 0:0 -:- ^:aa
q:cu w:u e:-e r:tl t:t y:y u:o- i:-i o:-o p:p @:a [:r
a:-a s:s d:a- f:e- g:i h:j j:i- k:k l:l ;:; ::: (voiced consonant)
z:ts x:x c:tx v:o b:e n:n m:m ,:, .:. _:oo
!:! ":" ':' (:( ):)
E:-ee R:ee Y:ii U:oo- I:-ii O:-oo
A:-aa D:aa- F:ee- J:ii-
?:?