45 Years Later, The Sinclair ULA Design Documents Surface hackaday.com

Original Ferranti design documents for the ULAs used across Clive Sinclair’s 1980s products have surfaced after being bought on eBay. The collection covers devices including the ZX81, Spectrum, ZX Printer and Microdrive; Sky, which now holds the intellectual property, permitted the documents to be shared through a catalogued online spreadsheet.