RAM Turbo Add-on for the Sinclair ZX Spectrum Computer
ZX Spectrum Upper RAM Module - zx.zigg.net
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32K RAM Module for Issue 1 Spectrums Bare PCB - Sinclair ZX Spectrum | eBay
hardware - Was the Ram Turbo the only 3rd party Interface 2 ROM cartridge interface for the ZX Spectrum or were there others? - Retrocomputing Stack Exchange
Some (non-video) fix updates: Spectrum 48k and Ram Turbo Interface – Mark Fixes Stuff – Retro game repair and reviews
ZX Spectrum 4116 RAM Replacement Board - Part 1
R.A.M. Walkthrough, ZX Spectrum - YouTube
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Tynemouth Software: A ZX Spectrum with 80K of RAM?
L Break Into Program - ZX Spectrum RAM
32K RAM Module for Issue 1 Spectrums Bare PCB - Sinclair ZX Spectrum | eBay