ZX Spectrum +2 Repair and RAM test, how to. - YouTube
ZX Spectrum Lower RAM Replacement Module V1.3 For Issue 2 - 6 PCBs
ZX Spectrum - Upper RAM Fault Diagnosis and Repair - YouTube
LGR Oddware - Sinclair RAM Turbo Interface - YouTube
FPGA Raises Component Video From A Sinclair ZX Spectrum | Hackaday
ZX Spectrum NEXT 1Mb RAM upgrade kit to 2Mb of Memory - NEW & TESTED - L@@K! | eBay
ZX Spectrum
Upgrading a 16K Spectrum to 48K - Spectrum for Everyone
Tynemouth Software: A ZX Spectrum with 80K of RAM?
RAM Turbo Add-on for the Sinclair ZX Spectrum Computer
external 128kB upgrade
Chips
R.A.M. Walkthrough, ZX Spectrum - YouTube
ZX Spectrum 48K Shadow of the Unicorn RAM Pack - Etsy
Sinclair ZX Spectrum +2 RAM Repair / Composite Video Fix - YouTube
Chips
Repairing and upgrading ZX Spectrum 16K – Ask Notes
4116 Dynamic ram STC 16K x 1 DRAM SINCLAIR ZX SPECTRUM 8PCS + Socket base (NEW) | eBay
L Break Into Program - ZX Spectrum Memory Map
SRAM replacement for ZX Spectrum lower 16K
