Re: DM8678 replacement
If you are going to include optional fonts which the original VDU didn't have, the only other thing I might suggest is a standard ASCII character set to make it easier to interact with other systems - unfortunately I can't think where you might get a suitable ready baked upper / lower case ASCII font - the character set used by generic HD44780 based alphanumeric LCD displays is well documented in data sheets but the lower case characters, especially the descenders, don't look very good in that font.
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