Microtan65 plasma fx

I found some old test fx I made for the Microtan 65 computer and posted a quick video on twitter here   Someone asked for the source so here it is.   This was compiled with a DOS assembler called AS6502 for some reason, so some of the formatting is odd.  (eg: dfb than the usual .byte)  I haven't looked at the Microtan machine since 2016 but I think I ported this from my older 'Plasma 190 bytes' version on the c64.  That would explain why I'm generating the sinetable when there's plenty of room.