🚀 go-pugleaf

I have a number of 'Spectrum 512', a 512-colours-on-the-screen picture format
for the Atari ST, which I would like to view on my A5000. The images would
fit on a Mode 15 screen, and could be displayed in all their glory if I had
some code to display a mode 15 screen, with a pallete switch at the beginning
of each scan line.

Would any kind person happen to have some code to display a mode 15 screen
in this way, that they were prepared to let me have? Or even some code to
display 'Spectrum 512' images?

Ideally, the code should work on any Acorn machine (obvious exceptions
disregarded), but if it only works with A5000/RO3.0 then that's good enough.

Any help would be appreciated,
Dave.

PS: If you do send me your code, please be assured I shall not distribute it
further without your concent.