I found an old LCD display (80 char/row, at least 10 rows) that
had the usual Oki row/column drivers behind the display itself,
but on the motherboard was the real brain of the LCD display -
the Hitachi HD64645. Unfortunately, like many other Japanese
semiconductor companies, they don't have much data online about
their chips, and I suspect that this one in particular has been
discontinued a long time ago.

So, would anyone happen to have a datasheet, or databook,
describing this controller chip? I was actually going to use it
as a wireless (434 MHz) terminal and put a PIC16F877 to control
the whole thing.

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