ZX Spectrum: Beta Disk interface in Micro Live (UK 1985)

Beta Disk Interface is a disk interface for ZX Spectrum computers, developed by Technology Research Ltd. (United Kingdom) in 1984 and released in 1985, with a price of £ (or £ with one disk drive). Beta 128 Disk Interface is a 1987 version, supporting ZX Spectrum 128 machines (due to different access point addresses). Beta Disk Interfaces were distributed with the TR-DOS (Technology Research DOS) operating system in ROM, also attributed to Technology Research Ltd.. The interface was based on the WD1793 chip. Latest firmware version is (1986). The Beta Disk Interface handles single and double sided, 40 or 80 tracks double density floppy disks, and up to 4 drives. This interface was popular for its simplicity, and the Beta 128 Disk Interface was cloned all around the USSR / ex-USSR. The first known USSR clones were ones produced by НПВО “Вариант“ (NPVO “Variant“, Leningrad) in 1989. Huge playlist archive with ZX Spectrum Adverts /