PREFACE Home computers are equipped with built-in software that enables them to be easily programmed to do quite complex tasks. The price that is paid for this programming ease is a relatively slow running speed, far lower than the speed at which the computer is really capable of running. Machine code programming entails direct programming of the microprocessor without using a built-in high level computer language such as BASIC. This gives a vast increase in running speed, but is something that can only really be undertaken by someone who has a reasonable understanding of the microprocessor and some of the other hardware in the computer. Machine code programming is not as difficult as one might think, and once a few simple concepts have been grasped it is actually quite straightforward (although admittedly never as quick and easy as using a high level language). This book takes the reader through the basics of microprocessors and machine code programming, and no previous knowledge of these is assumed. The microprocessor dealt with here is the Z80 which is not one of the most simple types, but is generally acknowledged as one of the most powerful X bit devices, and is by no means excessively difficult for beginners. The Z80. or in most cases now the faster version the Z80A, are used in many home computers, including several of the most popular machines such as the Sinclair ZX81 and ZX Spectrum, the Memotech MTX500 and MTX512 machines, and the Amstrad CPC-464. A few simple demonstration programs that can be run on these computers are included in this book. R.A.&J.W. Penfold | ★ AMSTRAD CPC ★ DOWNLOAD ★ |
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Page créée en 658 millisecondes et consultée 914 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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