Name: CAD-Master Light Pen more
Manufacturer: Trojan Products
Price: £17.25
Blurb: Create exciting graphics on screen.
Source: ZX Computing Aug/Sep 85
Note: Came with the CAD-Master Light Pen tape.

Name: Cambridge Colt Joystick Interface more
Manufacturer: Cambridge Computing Research
Price: £9.95
Blurb: Standard Kempston compatible joystick interface.
Source: Sinclair User Dec 84

Name: Cambridge Extender Bar more
Manufacturer: Cambridge Computing Research
Price: £4.95
Blurb: Extender bar (presumably at the back of the Spectrum), that incorporates a reset button.
Source: Sinclair User Dec 84

Name: Cambridge Intelligent Interface more
Manufacturer: Cambridge Computing Research
Price: £24.00
Blurb: Joystick interface. (includes tape) 1k on board memory. Own rear edge connector for printers. Compatible with all standard joysticks.
Source: Sinclair User Oct 83

Name: Cambridge Intelligent Joystick more
Manufacturer: Cambridge Computing Research
Price: £7.00
Blurb: At last a joystick that works ! Cambridge Computing brings you the first programmable joystick at a price you can afford. (requires interface & tape)
Source: Sinclair User Oct 83
Note: Came with the Cambridge Intelligent Joystick tape.

Name: Cambridge Intelligent Printer Interface (advanced) more
Manufacturer: Cambridge Computing Research
Price: £49.95
Blurb: Includes all features of the standard version + Different sized prints. Grey scale. Downloadable fonts.
Source: Sinclair User Dec 84

Name: Cambridge Intelligent Printer Interface (standard) more
Manufacturer: Cambridge Computing Research
Price: £39.95
Blurb: Centonics printer interface. Compatible with all standard print commands. Driver software stored in ROM.
Source: Sinclair User Dec 84

Name: CCI Lightpen more
Manufacturer: Custom Cables International Ltd
Price: £15.00
Blurb: Light pen. Software allows screens to be stored and recalled to create animations.
Source: Sinclair User Aug 84

Name: CCI Programmable Joystick Interface more
Manufacturer: Custom Cables International Ltd
Price: £15.00
Blurb: Programmable via a short Basic program that allows keys to be mapped to the joystick movements.
Source: Sinclair User Aug 84

Name: Celina Elima-Tapeloader more
Manufacturer: Celina Ltd
Price: £14.99
Blurb: Eliminate tape loading errors ! Device that connected between the cassette recorder and the Spectrum to remove unwanted noise for the signal.
Source: Your Spectrum issue 15. June 85

Name: Celina Loudmouth more
Manufacturer: Celina Ltd
Price: £12.99
Blurb: Beep amp for the Speccy.
Source: Your Spectrum issue 15. June 85

Name: Centronics Interface more
Manufacturer: Advanced Digital Systems Ltd
Price: £34.50
Blurb: Centronics printer interface.Supports all printer commands from BASIC.
Source: ZX Computing Aug/Sep 83

Name: Challenge Sprint more
Manufacturer: Challenge Research Ltd
Price: £64.95
Blurb: Looks like a standard cassette recorder, but plugs into the user port and gives up to 4 times load/save speed. Uses normal cassette tapes and is fully compatible with all existing software. Average 48k program loads in 75 seconds.Also includes a replacement ROM with faster load/save routines. It later became apparent that newer 'turbo-loader' software such as the older Ultimate titles, were not compatible. (Feb 85)
Source: Sinclair User August 84 and 16/48 mag (issue 12)
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Name: Challenge Sprint Mk II more
Manufacturer: Macway Ltd
Price: £69.95
Blurb: Same as the original Sprint but with Interface 1 compatibility.
Source: Ruggiero Antonio - Sinclair User Dec 85

Name: Chatterbox more
Manufacturer: William Stuart Systems Ltd
Price: £49.00
Blurb: Speech synthesis interface. Genuine phonetic synthesis. Unlimited vocabulary. Self contained speaker/amp.
Source: ZX Computing Aug/Sep 83

Name: Chatterbox II more
Manufacturer: William Stuart Systems Ltd
Price: £39.00
Blurb: "It can say anything. Genuine phoneme synthesis - not just recorded speech - hense unlimited vocabulary. Programmable pitch for more natural intonation. Solid tone cabinet for quality sound. Internal BEEP music amplifier. Expansion socket for 'Big Ears' voice recognition system."
Source: Your Computer March 85

Name: Cheetah 32k Ram Pack more
Manufacturer: Cheetah Marketing Ltd
Price: £39.95
Blurb: A ram upgrade to 48k. Simply plugs into the rear connector and gives full 48k.
Source: Sinclair User Oct 83

Name: Cheetah 68FX1 Keyboard more
Manufacturer: Cheetah Marketing Ltd
Price: £59.95
Blurb: 65 key full travel keyboard with single shift keys and full length space bar. 13 single key functions. True shift-lock. Space for Interface 1 inside.
Source: Sinclair User Dec 84
Note: This keyboard is sold by Cheetah, made by London Microtech Ltd and marketed by Fox Electronics.

Name: Cheetah Hi-Stak Feet more
Manufacturer: Cheetah Marketing Ltd
Price: £2.99
Blurb: Angled plastic feet for your Spectrum.
Source: ZX Computing Aug/Sep 85
Note: A similar device by the same name was produced by a company called Warp Factor Eight of Herts. and advertised in Sinclair User Feb 83.

Name: Cheetah Megasound more
Manufacturer: Cheetah Marketing Ltd
Price: £10.95
Blurb: Amplifies your sound via the TV speaker.
Source: ZX Computing Aug/Sep 85

Name: Cheetah MIDI Interface more
Manufacturer: Cheetah Marketing Ltd
Price: £49.95
Blurb: MIDI in/out/through. MIDI delay. Control any MIDI instrument. Forward & reverse sequence playback.
Source: Your Sinclair Jan 87
Note: Designed by Speedwell Software.
Came with the Cheetah MIDI Interface system tape.

Name: Cheetah MK5 Mini Interface more
Manufacturer: Cheetah Marketing Ltd
Blurb: The Cheetah MK5 Mini Interface is an interface to allow connection of the Cheetah MK5 MIDI Keyboard to a suitable computer, creating a powerful musical instrument with many exciting capabilities.
Note: Designed by Speedwell Software.
Came with the Mini Synth, The tape.

Name: Cheetah RAT more
Manufacturer: Cheetah Marketing Ltd
Price: £29.95
Blurb: Remote Action Transmitter. Infra red game pad that can be used for games. Kempston compatible.
Source: ZX Computing Aug/Sep 85
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Name: Cheetah Sound Sampler more
Manufacturer: Cheetah Marketing Ltd
Price: £44.95
Blurb: Sound sampler unit with microphone. Allows mixing of samples, forward or reverse, edit, reverb and echo effects. 17.5Khz bandwidth.
Source: ZX Computing October 86

Name: Cheetah SpecDrum more
Manufacturer: Cheetah Marketing Ltd
Price: £29.95
Blurb: Digital drum system for your Spectrum. 8 digital drum sounds. True digital drum machine. Extra sounds can be loaded from tape. Real time or on-screen programming. Store over 1000 rythms.
Source: Your Sinclair Jan 87
Note: Came with the SpecDrum system tape.
Three additional sound kits were made: SpecDrum - Afro Kit, SpecDrum - Electro Kit and SpecDrum - Latin Kit.
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Name: Cheetah Spectrum Joystick Interface more
Manufacturer: Cheetah Marketing Ltd

Name: Cheetah Sweet Talker more
Manufacturer: Cheetah Marketing Ltd
Price: £29.75
Blurb: Make your Spectrum talk ! A speech interface based on the Allophone system.
Source: Sinclair User May 84
Note: Came with the Chatbox tape.

Name: Chroma 1 Monitor more
Manufacturer: Chromagraphica
Price: £249.95 (extra £17.50 for sound)(£28.95 for Speccy converter)
Blurb: High res 14" colour monitor (585x895)
Source: Sinclair User May 84

Name: Clive Drive more
Manufacturer: Ergo Systems Ltd
Price: £59.95
Blurb: Disk interface with drive and printer port. Responds to all standard drive commands. Uses double sided drive allowing 50k per side. (100k per disk). Average loading time was 13 seconds.
Source: Crash 59. Dec 88
Note: An optional Clive Printer was also available.
This device was later sold by Video Vault, with an added back-up button. (Nov 89)

Name: Clive Printer more
Manufacturer: Ergo Systems Ltd
Price: £40 (approx)
Blurb: 80 character thermal printer. Dot addressable graphics. Inverse option. Expanded print option (160 chars). Uni or Bi directional.
Source: Crash 59. December 1988.
Note: This was a option when buying the Clive Drive, and could not be used without it.

Name: Cobra RS232 Interface more
Manufacturer: Cobra Technology Ltd
Price: £26.85
Blurb: Standard RS232 interface.
Source: ZX Computing Apr/May 83

Name: Co-Der more
Manufacturer: Jiles Electronics
Price: £99.95
Blurb: Allows tape to tape copying by connecting two recorders to the unit.
Source: Sinclair User Aug 83

Name: Cole RS232 more
Manufacturer: Cole Computing
Price: £12.00
Blurb: 110/300 baud RS232 output port.
Source: Sinclair User Feb 83

Name: Comcon Programmable Joystick Interface more
Manufacturer: Frel Ltd
Price: £17.95
Blurb: Programmable joystick interface for the Spectrum.
Source: Crash 4 (may 84)

Name: Comcon Twin more
Manufacturer: Frel Ltd
Price: £22.95
Blurb: Twin version of the Comcon Programmable, Having two ports.
Source: Sinclair User Jun 86

Name: Computilt Stand more
Manufacturer: Computer Add-ons
Price: £4.50
Blurb: Designed to tilt your Spectrum to a better working position.
Source: Sinclair User Oct 83

Name: Cool-It Unit more
Manufacturer: Kelwood Computer Cases
Price: £11.85
Blurb: Takes the heat out of your Spectrum. Lets your machine run cooler.
Source: ZX Computing Feb/Mar 84

Name: CP48 more
Manufacturer: Citadel Products
Price: £23.95
Blurb: Internal ram upgrade for your Spectrum. Gives 48k.
Source: ZX Computing Jun/Jul 83

Name: Cramic-SP more
Manufacturer: Camel Products
Price: £89.95
Blurb: Software paged 16k non-volatile Ram. Store programs quickly and simply.
Source: Sinclair User Jan 85

Name: Crescent 128 Quick Disk more
Manufacturer: Servicon Dynamics Ltd
Price: £117.44 (drive) £152.69 (interface)
Blurb: Another alternative to the microdrive claiming upto 20 times the speed. Stores 128k of data and can read 65k in 4-8 seconds. Has RS232 port and RGB port. Allows only 2 drives to be attached to the interface. An enhanced version (256i) could store 256k and cost £229.90
Source: Your Spectrum issue 15 June 85

Name: Crescent 401 + 2000DFS more
Manufacturer: Servicon Dynamics Ltd
Price: £129.95 (£199.95 with DFS os)
Blurb: Disk interface supporting 3" and 5.25" drives. DFS features upto 78 files (200k). Extended Basic commands. True random access. Uses 8k of Ram.
Source: Sinclair User Feb 85

Name: CS-DISK Interface more
Manufacturer: Circuit Design
Blurb: Also known as the `CD-DISK', it is able to control 4 standard double-density floppy drives as well as equips the Spectrum with CP/M compatibility. Furthermore it contains a Centronics printer interface and an interface for an IBM PC keyboard (which only works in CP/M). Formatting, copying and so on is done through CP/M programs.

Name: Currah MicroSlot more
Manufacturer: Currah Computer Components Ltd
Price: £14.95
Blurb: Splits your expansiion bus into two allowing two peripherals to be fitted at once.
Source: Your Spectrum issue 11

Name: Currah MicroSource more
Manufacturer: Currah Computer Components Ltd
Price: £44.50
Blurb: FORTH and Assembler cartridge with debug.
Source: Your Spectrum issue 11
Note: The ROM image is available at Phil Kendall's The Spectrum ROMs Collection.
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Name: Currah MicroSpeech more
Manufacturer: Currah Computer Components Ltd
Price: £29.95
Blurb: Speech synthesis box using the SP0256-AL2 speech processor. Outputs sound via the TV.
Source: Sinclair User Dec 83
Note: The ROM image is available at Phil Kendall's The Spectrum ROMs Collection.