MASK III: VENOM Strikes Back partially reversed 2019.11-2022... sources can be compiled with SjASM+
https://spectrumcomputing.co.uk/entry/3045/ZX-Spectrum/MASK_III_VENOM_Strikes_Back
https://www.the-tipshop.co.uk/cgi-bin/info.pl?name=MASK%20III%3a%20VENOM%20Strikes%20Back