Beta disk 3 to Beta disk 4 upgrade

I am searching for a manual to upgrade a Beta disk 3 to Beta disk 4. I have a very early pcb without the Magic button. It is from Technology Research.

Has anyone information about this?


Micky
Spectrum ZX 48 Harlequin Revision E, ZX Sprinter 2000, Tr-Dos Beta Disk.

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