The ZX Spectrum Ula: How to Design a Microcomputer (ZX Design Retro Computer) [email protected]@. This book takes the reader through the design and implementation of the Sinclair ZX Spectrum's custom chip, revealing for the first time the. [PDF] The ZX Spectrum ULA: How to Design a Microcomputer (Paperback) Microcomputer (Paperback) PDF, remember to refer to the link under and save the.
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About this product Description This book takes the reader through the design and implementation of the Sinclair ZX Spectrum's custom chip, revealing for the first time the decisions behind its design and its hidden secrets. By using it as case study, the techniques required to design an 8-bit microcomputer are explained, along with comprehensive details of the Ferranti ULA manufacturing process. If you have ever wanted to design your own computer or wondered what was behind the most successful microcomputer of the s, then this is the book for you. For the first time, the inner working of the Sinclair ZX Spectrum's custom chip and heart of the computer, the Ferranti ULA, is exposed in minute detail. Packed with over illustrations and circuit diagrams, this book takes the reader through the cutting edge techlogy that was the Ferranti ULA and the design of the ZX Spectrum home computer, illustrating the principles and techniques involved in creating a cost effective computer that required thing more than a television set and a cassette recorder. The ZX Spectrum ULA is an essential read for the electronics hobbyist, student or electronic engineer wishing to design their own retro-style microcomputer or anyone with an interest in historical micro-electronic and digital design. All topics are explained in simple yet precise terms, building on their careful introduction towards the full functionality presented by the Sinclair computer.
According to the official service manual, approximately 26, of these original boards were manufactured. An external tape recorder was needed to load the majority of software released, or the ZX Microdrive. Either socket could be connected to headphones or an amplifier as an audio output, although this would not disable the internal speaker. This external heatsink lead to the system's nickname, "The Toast Rack".
The machine was simultaneously presented for the first time and launched in September at the SIMO '85 trade show in Spain, with a price of 44, pesetas.
The new commands took the place of two existing user-defined-character spaces causing compatibility problems with certain BASIC programs. Sound was produced from the television speaker instead.
The machine featured an all-new grey case featuring a spring-loaded keyboard, dual joystick ports, and a built-in cassette recorder dubbed the "Datacorder" like the Amstrad CPC , but was in most respects identical to the ZX Spectrum The main menu screen lacked the Spectrum 's "Tape Test" option, and the ROM was altered to account for a new Amstrad copyright message.
These changes resulted in minor incompatibility problems with software that accessed ROM routines at certain addresses.
Despite these changes, the layout remained identical to that of the For this to be showed correctly, both interrupt timmings and ULA timmings have to be perfect. Hicolor Timex demo screen. The "Videos" section features this demo.
NOTE: only the hicolor mode is supported. The same clone, now using a proper RGB output. Don has added a piggy-back board that connects to the Gameduino.
Bottom view of above design. PDF Formatted 8.
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