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Why is impossible play this music on ZX128 ? Set D7 of port 7FFD ? D6 is next paging bit on Pentagons for access to memory up to 256kB(pages 8-15). If you set D7 then program will access to memory pages(16-23). This pages is used for ramdisc (see KILL menu in GLUK). Loading to this pages = rewrite data at end of ramdisc. Memory on Pentagon 1024:
1MB = complette memory
1024kB - 768kB ramdisc(gluk) = 256kB for ZX memory !!!
All higher pages can contain ramdisc data.

My idea: detect before start memory paging and use D6 for Pentagon or D7 for Phoenix.
This is E-TUNES 7 using D6 on port 7FFD for Pentagon 256,512 or 1MB. On 1MB pentagon memory use only first 256kB and all next pages can be used for ramdisc (up to 768 kB)
etunes_7_for_pentagon256.zip