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Beta Disk Interface

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Beta disc interface is a disk interface for ZX Spectrum computers. It was developed by Technology Research Ltd (UK), in 1985. Beta 128 is a version for ZX Spectrum 128 machines. Beta disc interfaces were distributed with TR-DOS operating system in ROM, also attributed to Technology Research Ltd. Latest firmware version is 5.03 (1986).

The interface handles SS/DS, SS/DD floppy disks, up to 4 drives.

Clones

This interface was popular for its simplicity, and was cloned all around USSR. First known USSR clones were ones produced by НПВО "Вариант" in 1989.[1] Beta 128 schematics are included in various Russian ZX Spectrum clones.

Some variants of schematics support only 2 drives. Phase correction of drive data signal is made different ways.[2][3]

Operating systems supporting Beta 128 disc interface

References

  1. ^ Sinclair ZX Spectrum. Beta Disc / TR-DOS. Аппаратные средства. Стандартный интерфейс дисковода. - С.-Петербург, 1994
  2. ^ Рюмик С. Контроллер дисководов. Канал записи / Радиолюбитель. Ваш компьютер, 1998, NN10-12; 1999, N1
  3. ^ Рюмик С. Контроллер дисководов. Канал чтения / Радиолюбитель. Ваш компьютер, 1999, N4-8

See also

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