COOL!!! My first proper hardware add on! I've connected up the remaining lines, added some power and wrote a little test program to initilaise it, and then print to it and hay presto! A little LCD screen add-on!
Of course...Its not that easy. I've missed out a lot of stuff here. For proper full speed access I need to be able to read the busy line which requires READ access. This in turn requires another buffer (I think), and some more logic to detect the READ line and then setting the datalines (at least 1 bit) to be the values it needs to be. All I've done just now is put in some big delays so I know the text will have been set.
Although...after playing a little...it looks like the Plus/4 is so slow.... the delays can more or less be taken out! Which is pretty cool...Still, its not "right", but it does work. I also have no way to reset it properly just now, which means I'd have to add some rest circuitry.
But aside from this...I don't care! It works! Its really easy to write to! And its cool!!!