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  • Beta Disk Interface is a disk interface for ZX Spectrum computers. It was developed by Technology Research Ltd, in 1984 and released in 1985 with price £109.25. Beta 128 Disk Interface is a 1987 version supporting ZX Spectrum 128 machines. Beta disk interfaces were distributed with TR-DOS operating system in ROM, also attributed to Technology Research Ltd. Latest firmware version is 5.03. The interface was based on the WD1793 chip. The interface handles single and double sided, 40 and 80 track double density floppy disks, up to 4 drives.

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