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United Kingdom: ZXDesign Technology and Media. pp. 224–227. ISBN 978-0-95-650710-5. "48K ZX Spectrum Technical Information". worldofspectrum.org. Retrieved...52 KB (5,361 words) - 13:42, 24 July 2024
Spectrum ULA: How To Design A Microcomputer. ZX Design and Media. ISBN 9780956507105. OCLC 751703922. "Uncommitted IC logic". Design How-To. EDN. 5 April...28 KB (3,561 words) - 06:08, 16 June 2024
