Rotronics Wafadrive
Magnetic tape storage peripheral for the ZX Spectrum.
The Rotronics Wafadrive, a magnetic tape storage add-on for the ZX Spectrum home computer, hit the market in late 1984. It was designed to go head-to-head with Sinclair's ZX Interface 1 and ZX Microdrive. Unlike standard cassette tapes, each Wafadrive cartridge uses a continuous loop of tape. The unit itself packs two of these "stringy floppy" tape drives, plus an RS-232 interface and a Centronics parallel port. The drives operate at two speeds: a high speed for seeking and a lower speed for reading and writing, the latter being notably slower than the Microdrive. The cartridges—called wafers—are physically larger than Microdrive cartridges and are the same type used in Entrepo stringy floppy drives for other microcomputers. They came in three nominal capacities: 16 kB, 64 kB, and 128 kB. The larger sizes suffered from slower access due to their longer tape length. The same drive mechanism, made by BSR, and the same cartridges also appeared in at least two other devices: the Quick Data Drive (QDD), which connected to the cassette port of the Commodore 64 and VIC-20, and the A&J Micro Drive System 100, which linked via the RS-232 port to the TRS-80 Model 100 and its clones (the Kyotronic KC-85, NEC PC-8201 and PC-8300, and Olivetti M10).
- Launch
- late 1984
- Platform
- ZX Spectrum
- Drive count
- 2
- Interfaces
- RS-232, Centronics parallel
- Media
- continuous loop tape cartridges (wafers)
- Capacities
- 16 kB, 64 kB, 128 kB
Lore & Background
The Wafadrive comprises two continuous loop stringy floppy tape drives, an RS-232 interface and a Centronics parallel port. The drives can run at two speeds: high speed for seeking and low speed for reading/writing, which was significantly slower than that of Microdrives. The cartridges, or wafers, are the same as those used in Entrepo stringy floppy devices for other microcomputers and are physically larger than Microdrive cartridges. They were available in three nominal capacities: 16 kB, 64 kB, or 128 kB, with larger sizes having the disadvantage of slower access due to the longer length of tape.
The same drive mechanism, manufactured by BSR, and cartridges were used in at least two other similar devices: the Quick Data Drive (QDD), designed to connect to the cassette port of Commodore 64 and VIC-20 home computers, and the A&J Micro Drive System 100, for TRS-80 Model 100 and its clones (Kyotronic KC-85, NEC PC-8201 & PC-8300, Olivetti M10), connected via the RS-232 port.
Reader's Guide
The Rotronics Wafadrive represents an attempt to provide faster, more convenient storage for the ZX Spectrum than standard cassette tape, using continuous loop tape cartridges. Its inclusion of an RS-232 interface and Centronics parallel port added connectivity options beyond storage. However, its read/write speed was significantly slower than that of the competing Sinclair Microdrive, and larger capacity wafers suffered from even slower access. The use of the same BSR-manufactured drive mechanism and cartridges in other devices for different platforms—such as the Quick Data Drive for Commodore computers and the A&J Micro Drive System 100 for portable computers—indicates a broader, if niche, market for this tape technology. The Wafadrive's legacy is tied to the ZX Spectrum ecosystem of the mid-1980s, where it offered an alternative to Sinclair's own Microdrive system but did not achieve the same level of adoption.
Did You Know?
- Each Wafadrive tape is a continuous loop, unlike standard cassette tape.
- The same BSR-manufactured drive mechanism was used in the Quick Data Drive for Commodore computers.
- Wafadrive cartridges are physically larger than Microdrive cartridges.
Frequently Asked Questions
What is the Rotronics Wafadrive?
It is a magnetic tape storage peripheral built for the ZX Spectrum, released in late 1984 as a direct competitor to Sinclair's own ZX Interface 1 and ZX Microdrive ecosystem.
What kind of media does the Wafadrive use?
It reads and writes on small cartridges nicknamed "wafers," each containing a continuous loop of magnetic tape rather than a standard cassette reel. Capacities came in 16 kB, 64 kB, and 128 kB variants.
How does the Wafadrive compare to the ZX Microdrive?
Rotronics marketed it as a head-to-head alternative to the Microdrive, but its data read/write speed was noticeably slower than Sinclair's drive, even though it offered a dual-drive configuration in a single unit.
What interfaces and ports does the Wafadrive provide?
Beyond its two built-in tape drives, the unit includes an RS-232 serial port and a Centronics parallel port, giving Spectrum owners extra connectivity options for printers and other peripherals.
How do the Wafadrive's tape drives operate?
Each of the two "stringy floppy" drives runs at two distinct speeds: a higher speed used for seeking to the correct position on the loop, and a lower speed dedicated to actual reading and writing of data.
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