Name: I2L Joystick Interface more
Manufacturer: Interactive Instruments Ltd
Price: £14.95
Blurb: Standard Kempston compat. joystick interface.
Source: Home Computer Weekly August 83

Name: I2L Spectrum Sound more
Manufacturer: Interactive Instruments Ltd
Price: £9.95
Blurb: Sound amp with speaker and Load/Save switch.
Source: Home Computer Weekly August 83

Name: Indescomp 32k Ram Pack more
Manufacturer: Indescomp S.A.
Price: £39.95
Blurb: Upgrade 16k Speccy to 48k
Source: Your Computer June 84

Name: Indescomp Centronics and RS232 Interface more
Manufacturer: Indescomp S.A.

Name: Indescomp Domestic Controller more
Manufacturer: Indescomp S.A.
Price: £49.95
Blurb: None, but I assume its an interface to control electical systems by switching the power on or off.
Source: Your Computer June 84

Name: Indescomp Joystick Interface more
Manufacturer: Indescomp S.A.
Price: £14.95
Blurb: Standard (Kempston) joystick interface.
Source: Your Computer June 84

Name: Indescomp Sound Amplifier more
Manufacturer: Indescomp S.A.
Price: £10.95
Source: Your Computer June 84

Name: Input-Output Peripheral more
Manufacturer: Investronica S.A.

Name: Interface 007 more
Manufacturer: ZX-Guaranteed
Price: £34.95
Blurb: Back-up interface with built in joystick port.
Source: Your Sinclair May 86

Name: Interface III more
Manufacturer: Evesham Micro Centre
Price: £39.95
Blurb: Transfers every program to microdrive. Snapshot anything in memory and dump to drive.
Source: ZX Computing Aug/Sep 85

Name: Interspec more
Manufacturer: DCP Microdevelopments Ltd
Price: £39.95
Blurb: Multi port exspansion. Includes; 8bit TTL input, 8bit TTL output, 8 channel digital/analogue converter.
Source: ZX Computing Apr/May 83

Name: Interstate 31 more
Manufacturer: Bud Computers Ltd
Price: £11.95
Blurb: Joystick interface that supports the IN 31 command as used by Kempston. Also includes rapid fire and reset switch.
Source: Sinclair User Jan 85

Name: Interstate Pro more
Manufacturer: Bud Computers Ltd
Price: £22.95
Blurb: Programmable joystick interface. Allows the unit to 'remember' settings via onboard 1k Ram. Also includes reset switch.
Source: Sinclair User Jan 85

Name: I-Pack more
Manufacturer: Griffin Electronics
Price: £15-20 approx.
Blurb: Input/output interface with 8 analogue and 4 digital inputs and 4 digital outputs.
Source: Magnus Loutit

Name: ISS Joystick Interface more
Manufacturer: ISS
Blurb: Joystick Interface