In the following "databus" means that the v9990 doesn't assert the bus, it doesn't provide data, so the value read is "floating-bus" or the value on the z80 databus at the time. More commonly on CPC it's &ff, but there are some configurations of CPC where this differs.
In the following "width" and "height" refer to "image space width" and "image space height" which differ from display width and height.
=== Kanji ROM ===