Ok next part to work on is to create sprite tiles. I found this excerpt from David Joiner (Talin) about FTA.
https://medium.com/@dreamertalin/the-faery-tale-adventure-a-personal-history-4fae0617a18d
However, I knew that I would not be able to draw a world that huge. So I came up with the idea of ‘meta-tiles’ or ‘super-tiles’. You see, most games in that era used ‘tiled’ artwork — that is, the background consists of square, 2-dimensional bitmaps which could be re-used many times within a single scene. I hit on the idea of creating ‘super-tiles’ which were made up of smaller tiles. Each tile was 16 x 32 pixels, and each super-tile was 16 x 8 tiles, for a total of 256 x 256 pixels. This allowed me to create vast amounts of terrain with only modest amounts of memory — the final overland map was roughly 100 screens wide and 150 screens tall.
So this explains how the 17k screens is arranged and the tiles. Time to look at the Fuze image editor