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
Sinclair ZX Spectrum turns 40 – Born's Tech and Windows World
Chips
ZX Spectrum 16K to 48K memory upgrade kit | ByteDelight.com
RAM Turbo Add-on for the Sinclair ZX Spectrum Computer
4116 Dynamic ram STC 16K x 1 DRAM SINCLAIR ZX SPECTRUM 8PCS + Socket base (NEW) | eBay
128k RAM expansion for ZX48k : r/zxspectrum
RAM pack - Wikipedia
Sinclair ZX Spectrum - issue one logic board and optional 32k ram expansion Stock Photo - Alamy
Diagnosing 48K Spectrum Upper RAM Faults | ProjectAVR
ZX Spectrum 4116 RAM Replacement Board - Part 1
SINCLAIR ZX SPECTRUM - RAM KIT - 2pcs 4116 + 2pcs socket professional (NEW) | eBay
/i/18768/products/2020-06-30T19%3A25%3A47.962Z-DSC06632.JPG?1606306133 "Glitch Works Altair 680 Universal 64K RAM Board from Glitch Works, LLC on Tindie")
Glitch Works Altair 680 Universal 64K RAM Board from Glitch Works, LLC on Tindie
ZX Spectrum Upper RAM Module - zx.zigg.net
Refurbishing a 48K Rubber Keyed Sinclair ZX Spectrum – Pt.3 Upper RAM Replacement | ProjectAVR
RAM Turbo Add-on for the Sinclair ZX Spectrum Computer
LGR Oddware - Sinclair RAM Turbo Interface - YouTube
/i/314604/products/2023-11-01T08%3A39%3A02.252Z-IMG_20231101_092718.jpg?1698802760 "128k RAM expansion for ZX Spectrum from Tyrell on Tindie")
128k RAM expansion for ZX Spectrum from Tyrell on Tindie
external 128kB upgrade
SINCLAIR ZX SPECTRUM - RAM KIT - 2pcs 4116 + 2pcs socket AUGAT round pin (NEW) | eBay
Tynemouth Software: A ZX Spectrum with 80K of RAM?
ZX Spectrum - Upper RAM Fault Diagnosis and Repair - YouTube
L Break Into Program - ZX Spectrum Memory Map
