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เนื้อหาย่อ : INTRODUCTION f two books that replace An Introduction to Microcomputers: Volume 2- Some Real Microp hrough several printings and in 1978 was printed loose-leaf. Six bimonthly updates to the l san were published in 1979 and early 1980 to provide information on newly introduced microprocessor devices. The ion proved, however, to be quite unpopular with bookstores because of packaging and har It also became more and more difficut to maintain a timely flow of bimonthly updates. For th g replaced by two bound paperback books: The Osborne 4 & 8-Bit Microprocessor Microprocessor Handbook. Together these handbooks include all of the information th @2 and the six updates. All know errors have been corrected and new data sheets have be ooks. We have divided Volume 2 into two separate handbooks because the single-volume ages in length and rather difficult to bind. In addition, the devices lend themselves to this microprocessors re geneally much more powerful than the four- ad eight-bit micropro we directed toward different applications. he 2 was part of a four-volume Introduction to Microcomputers series: Volume O - The Beginner's Book was written for readers who know nothing about computers. ume -Basic Concepts provides a detailed explanation of microprocessor concepts, including n dressing modes, typical struction sets, input/output techniques, and so on. The n the 4 & 8-Bit Microprocessor Handbook and the 16-Bit Microprocessor Handbook as rking knowledge of the general concepts presented in Volume 1, and we will oc references to material presented in Volume 1. 2- Some Real Microprocessors, which is being replaced by these handbo ume 3 - Some Real Support Devices, which describes general support devices that ma nicroprocessor. Some dedicated support devices are described in the 4 & 8-Bit Mi wook and the 16-Bit Microprocessor Handbook. We define a "dedicated" support dev with its parent microprocessor. We define a"general" support device as one that can b or. We will occasionally make references in this book to some of the general s Volume 3. When designing a syster based on one of the microprocessors d ook,you should not automatically assume that the dedicated support devices describ only ones o the best ones to use with a particular microprocessor: you should always tionally equivalent parts described in Volume 3 to this Introduction to Microcomputers series, we have begun publishing other individual andbooks of this series are:The 8089 //0 Processor Handbook. which includes the 8289 bu andbook which describes LSI CRT controller devices. This individual handbook appro ure to maintain a convenient flow of detailed, objective information on new microprocessors t cavices. SIGNAL CONVENTIONS ve high, active low or active in two states. An active high signal is one which, in causes events to occur, while in the low state has no significance. A signal that is active low causes s to occur when in the low state, but has no significance in the high state. A signal that has two active use two different types of events to occur, depending upon whether the signal is inactive state. Within this book a signal that is active low has a bar placed over the sig Ridentifies a ''write strobe'' signal which is pulsed low when data is ready for ex al that is active high or has two active states has no bar over the signa