
ZX Spectrum - Wikipedia,

Sinclair ZX Spectrum by Samsung – Sinclair Collection Site,

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ZX-9R C Model General Specs; Colors, Bearings, Maintenance,

File:Sinclair ZX Spectrum Issue 1 Motherboard.jpg,

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File:Sinclair ZX Spectrum Issue 4B Motherboard.jpg,

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On retro-computing: Sinclair ZX Spectrum – Quantum Bits,
![Gobble a Ghost [16K] : CDS Microsystems : Free Download Gobble a Ghost [16K] : CDS Microsystems : Free Download](https://archive.org/download/zx_Gobble_a_Ghost_1982_CDS_Microsystems_16K/zx_Gobble_a_Ghost_1982_CDS_Microsystems_16K.gif)
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The Sinclair ZX Spectrum Turns 40 | Hackaday,

Sinclair ZX80 - Vintage Computer,

Sinclair ZX Spectrum 128K - Old Crap Vintage Computing