.RDS 1   ...switch Radastan on
.RDS 0   ...switch Radastan off
.RDS s   ...set palette, fill ULA+ registers by memory data
.RDS g   ...get palette, store colors from ULA+ registers to memory
.RDS c   ...clear pixel area

download:
https://esxdos.samcoupe.cz/dotcmd/RDS

convertor:
https://github.com/Utodev/radascreen

screen examples:
https://spectrumcomputing.co.uk/forums/ … amp;t=5701

Load and set a new palette:
LOAD *"name.PAL" CODE 22528
.RDS s

Save palette:
.RDS g
SAVE *"name.PAL" BIN 22528,16

Load and show Radastan screen:
.RDS 1
LOAD *"name.SCR" CODE 16384
.RDS s
PAUSE 0
.RDS 0

Save Radastan screen:
.RDS g
SAVE *"name.SCR" BIN 16384,6160

tested on the MB03+ and eLeMeNt ZX, should work on all ZX-Uno models and also SpecNext