Beta Disk Interface
Disk interface for ZX Spectrum computers / From Wikipedia, the free encyclopedia
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Beta Disk Interface is a disk interface for ZX Spectrum computers, developed by Technology Research Ltd. (United Kingdom) in 1984[1] and released in 1985, with a price of £109.25 (or £249.75 with one disk drive).[2]
Beta 128 Disk Interface is a 1987[3] version, supporting ZX Spectrum 128 machines (due to different access point addresses).
Beta Disk Interfaces were distributed with the TR-DOS operating system in ROM, also attributed to Technology Research Ltd.. The interface was based on the WD1793 chip.[4] Latest firmware version is 5.03 (1986).
The Beta Disk Interface handles single- and double-sided, 40- or 80-track double-density floppy disks, and up to four drives.