EB - Electronic Book (Text + Graphics, Japan Only. 1990)
EBG - Electronic Book Graphics (Text + Graphics, Outside Japan Only. 1991?)
EBXA - Electronic Book Extended Architecture (Text + Graphics + Audio, Worldwide. 1992?)
EBXA-C - EBXA-Chinese (EBXA with Chinese character support, Japan Only)
S-EBXA - Super EBXA (EBXA with Color Support, Japan Only?)
The EBG is the first Western format (1991) and on the first Western model, the DD-1EX, which can use bare mini-CD as well as caddys.
The EBXA is at least the DD-8 and DD-20 models. The EBXA models also run EBG titles. Certainly available from 1992.
The DD-8 and DD-20 use only caddy based mini-CD.
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