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- Documents the Sinclair ZX Interface 2 for use with the Sinclair ZX Spectrum.
- Documents the available ROM cartridges along with details about unreleased prototype cartridges.
- Provides details on building new cartridges, including ZX80, ZX81, Jupiter Ace and Spectrum 128 emulator ROMs and 32K-64K cartridges.
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- Describes how to build a SCART cable for the Sinclair ZX Spectrum 128/+2/+3 and QL, providing full design calculations.
- Documents the keypad for the Spectrum 128 and describes how to build a compatible keypad.
- Documents the promotional literature released about the Spectrum 128.
- Describes how to extend 128 BASIC.
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