When I told someone about this book, his reaction was "How can you write a whole book about RS-232?" A good question. In fact Joe Campbell has written a book that explains how to cope with devices that are supposed to conform to RS-232, but don't After all, if all 'RS-232' interfaces realty were what they claimed to be, the only problems would be in connecting two devices of the same gender — two dte's (speaking loosely, a dte is a device that ‘looks like' a terminal) or two dee's (similarly, a dce 'looks like' a modem). More formally, a dee stands for 'data communications equipment', while dte means 'data terminal equipment'. Anyway, Campbell's point is that everything was fine while RS-232 interfaces were used to connect terminals to modems, but problems arise from the compromises and variations necessary to adapt it to a variety of different situations. Adopting a policy of first things first — always sensible — he starts by establishing what serial communications is about and how much can be read into a claim of 'RS-232 compatibility'. Then it's down to work with the 'interfacer's toolkit': a small collection of test clips, cables, and adaptors. Apart from the introductory material, most of the (very practical) information is presented in case study form. The cases involve a wide variety of equipment to illustrate a range of problems that can occur when interfacing. The items used are — in the main — popular things like Epson and OK Microline printers and Kaypro, Osborne and IBM computers, so much of the information is likely to be of direct use and not simply illustrative. One of the best things about the book is that it presents a systematic approach to the problem of interfacing partially incompatible equipment, while there is no guarantee that you will "get it right the first time". There's not a lot more I can say about this book, except to mention that it has proved useful on several occasions since it arrived for review. Oh, there was one other thing — the elephant cartoons are delightful! APC
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Page créée en 595 millisecondes et consultée 358 foisL'Amstrad CPC est une machine 8 bits à base d'un Z80 à 4MHz. Le premier de la gamme fut le CPC 464 en 1984, équipé d'un lecteur de cassettes intégré il se plaçait en concurrent du Commodore C64 beaucoup plus compliqué à utiliser et plus cher. Ce fut un réel succès et sorti cette même années le CPC 664 équipé d'un lecteur de disquettes trois pouces intégré. Sa vie fut de courte durée puisqu'en 1985 il fut remplacé par le CPC 6128 qui était plus compact, plus soigné et surtout qui avait 128Ko de RAM au lieu de 64Ko. |
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