Module 9 has a new section

This is for the Graphcial LCD 128x64 ST7920

That was !&"£"£ tricky not least because the datasheet is lying!

You can learn why a memory map is needed to allow the graphics
to operate at all when using SPI mode (it is bascally because you
can't read the display memory when using SPI). I think you can read
and write the interface if it is used in a parallel mode and so could
save memory i.e. not need a memory map.

However this code shows how to use the graphics in SPI mode.

Best Regards John Main