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The heart of the ZX Spectrum series of computers is a custom chip called the ULA (Uncommitted Logic Array). This was a technology pioneered by Ferranti, FERRANTI. SEMICONDUCTORS. A short-form data book covering discrete components & Individual data sheets are available on request, as is technical advice A REMOTE DESIGN STATION FOR CUSTOMER UNCOMMITTED LOGIC ARRAY DESIGNS. F r a n k R. R a m s a y. Ferranti. Electronics. Limited.1.Automation of Design for Uncommitted Logic Arrays. · 2.ULA Technical Handbook Issue 1 - Ferranti Electronics Limited. · 3.RSX11M Digital Equipment Corporation This chapter supplements Chapter 5, The Ferranti ULA. A glossary of terms is provided at the end of the book, along with a comprehensive bibliography. 9 ULA Technical Hand Book Issue 1. ALICE reference Manual. 3.SAM Integrated Circuit Testing Language Ferranti Electronics Ltd. Internal Document.