OPUS Discovery Interface
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The'Opus Discovery 1 is a disk interface for ZX Spectrum home computers, released in 1985 by the British company Opus Supplies Ltd.
Caracteristics[edit]
Designed initially for the 48Kb models, versions for the 128Kb models were also released later. [1]
A built-in power supply controlled by an On/Off switch on the casing fed both the interface and the computer.
The commands in BASIC which controlled data storage, and the printer port, were largely compatible with Sinclair Research's ZX Interface 1 and Microdrive(s). Model 1 could only read/write on 178Kb [formatted] 3.5" floppies. Model 2 came with a second 778k [formatted] DS-DD drive and a 6116 (2kx8) SRAM that also allowed BASIC commands to be added. Several (third parties) ROMs were also developed aim at adding functionalitie, and speeding up disk operations. It was connected to the rear expansion port of the computer, and the device in turn had the following connectors for expansion:
- Bays and internal Shugart connectors for two 3.5" diskette drives
- A composite black and white video output
- A Kempston compatible joystick port (Atari 9-pin type)
- A parallel printer port for Epson compatible printers.
- A generic expansion port (no NMI), to piggy-back other peripherals.
Floppy disk controller: WD1770
References[edit]
- ↑ John Lambert (May 1985). "A Voyage of Discovery". Sinclair User. No. 38. pp. 37–38. Archived from the original on 2011-09-07. Retrieved 2022-09-19.
External links[edit]
- OPUS Discovery Disk UtilitiesArchived 2007-03-11 at the Wayback Machine
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