Microcomputer

“ Short takes about how to get started ====================================
* a computer * modem and a communications program
You must have a computer ———————————— It is not important what kind of computer you have, though you may find out that it is an advantage to have a popular one. The most common type of microcomputer today is called MS-DOS computers (or IBM PC compatibles or IBM clones) . Your computer should have enough memory for communication. ”

“ The assembly sector minicomputer,.on the other hand, directs the many microcomputers which control its various assembly robots, transport robots, and warehouse robots. The entire manufacturing system is thus controlled by a hierarchy of distributed computers, and can simultaneously manufacture subsets of groups of different products after fast, simple retraining exercises either Programmed by an "intelligent" central computer or remotely by human beings. ”

“ In medium and large systems the use of small computers for coupling input and output devices to the main computer offers a number of attractive advantages, especially now that mass production and competition have brought the prices down so low that a large amount of hardware nearly ideal for the purpose is available at a bargain. Some advantages: (1) The small machine can control data acquisition, accumulating blocks of data while the large machine is doing background calculations, interrupting those calculations only occasionally to transfer raw or partially processed data. ”

“ However, significant advances in computer hardware and software have been made since that time. In particular, dramatic advances in large-scale integrated circuitry and microprocessor technology have permitted fabrication of mini-computers, micro-computers, and other special purpose devices, which are capable of duplicating many of the data-manipulative capabilities which were previously available only at centralized locations housing large scale general-purpose computers. ”

“ In one sense, such devices are computationally universal. That is, certain mathematical technicalities aside, they can carry out any arbitrary Turing machine computation and, accepting the Church-Turing Thesis, can also carry out any algorithmic process. Thus, if any machine can be intelligent one need look no further than to a general-purpose computer, for there is some program which will cause the machine to display the desired intelligent behavior. This is so even if one insists that brains, for example, are machines, but are not at all like digital computers. ”

“ On left is an array of 16 analog computers; at right is a large digital data-processing system.
The facility can perform scientific and business tasks simultaneously.
The dictionary also gives us a good clue to the digital computer: “Digital.—Of the fingers or digits.” A digital machine deals in digits, or discrete units, in its calculations. For instance, if we ask it to multiply 2 times 2, it answers that the product is exactly 4. A slide rule, which we have said is an analog device, might yield an answer of 3.98 or 4.02, depending on the quality of its workmanship and our eyesight. ”

“ Not all hardware and software are compatible. In fact, hundreds of producers of computer equipment and computer programs are in the market, and there are few across-the-board standards. So it's important to get hardware and software that are compatible.
Software, or the computer programs themselves, are not like records that can be played on any record player. They have to be compatible with the hardware in terms of the programing language used, operating system, size, format, and other factors. ”

“ Then I asked myself, if it isn't suited to computers, what is it good for? It's no good for computers because it doesn't discharge completely. Or rather, it does and it doesn't. Its structure is altered by the saturation charge and subsequent discharge in the computation processes. But random and not-so-random charges build up again for some reason, and interfere with computations after the machine has been used a few times. I puzzled over this. It was too much like true memory. I think what we have in this computer setup is more like a non-living thinking brain than a simple computer. ”

“ New computer hardware, unadorned with such snares and delusions as an {operating system}, an {HLL}, or even assembler. Commonly used in the phrase `programming on the bare metal', which refers to the arduous work of {bit bashing} needed to create these basic tools for a new machine. Real bare-metal programming involves things like building boot proms and BIOS chips, implementing basic monitors used to test device drivers, and writing the assemblers that will be used to write the compiler back ends that will give the new machine a real development environment. ”

“ Data bases, sometimes. “But word processors definitely take the cake.
“You’ve got to deal a lot with special features on printers, like boldfacing and underlining and whether the software will let them work right,” Park says. He suggests the obvious—that before buying new software, you find out how it will run with your printer and computer. Of course, as stated earlier, you’ll ideally select your hardware after you’ve chosen your general range of software. Park says most people don’t fully “realize the implications” of the software they’re ordering “because they haven’t thought of it yet.” ”

“ Don't underestimate the amount of time and effort it will require to collect data, make sure it's accurate, enter the data, and run the analyses.
It's important to consider how user-friendly the computer is, and how much the computer's software will do to guide you through the analysis.
A computer will do calculations very quickly, perhaps saving hours of laborious figuring. A computer will store information from one time period to the next, and recalculate alternatives quickly. By making the information available, it will help you identify strong and weak points in your operation. ”

“ What kind of computational ability do you want your computer to have? Will it serve the computing needs you have identified for now and later?
Input and Output Devices. What kind of output do you need? What additional pieces of equipment or peripherals (such as separate screen, disk drive, modem, printer) will you need to buy to make this system do what you want it to?
Most agricultural programs require a printer. A dot matrix printer (which produces characters made of small dots) may be sufficient. Another option is a letter quality printer, which is more expensive. ”

“ Modern, high-speed computers, such as the 1401, are marvelous electronic instruments, but they represent only portions of data processing systems. Well-tested programming languages for communication with computers must accompany the systems. It is through these languages that the computer itself is used to perform many of the tedious functions that the programmer would otherwise have to perform. A few minutes of computer time in translating the program can be equal to many, many hours of staff time in writing instructions coded in the language of the computer. ”

“ It can also “learn” to play a mediocre game of chess.
If we investigate the workings of a digital computer, we find much to remind us of the human brain. First is the obvious similarity of on-off, yes-no operation. This implies a power source, usually electrical, and a number of two-position switches. The over-all configuration of the classic computer resembles, in principal if not physical appearance, that of the human brain and its accessories.
As we have learned, the electronic computer has an input section, a control, an arithmetic (or logic) section, a memory, and an output. ”

“ Unless an appropriate set of standard input-output devices is provided, the computer will not be used efficiently. A balanced system with a small computer is likely to prove much more useful than an unbalanced system with a medium-sized computer. What is necessary will, of course, depend upon the uses of the system. For example, if a large amount of program development is anticipated, the inclusion of a line printer should certainly be considered, because universal experience has shown that line printers are immensely valuable during program development ”

“ Proper interconnection of sufficient on-off switches makes possible the 87most flexible of all computers—man’s brain. By the same token, man-made computers of the digital type can do a wider variety of jobs than can the analog which seemingly is more sophisticated.
A second great virtue of the digital machine is its accuracy. Even a trial machine of Babbage had a 5-place accuracy. This is an error of only one part in ten thousand, achievable in the analog at great expense. This was of course only a preliminary model, and the English inventor planned 20-place accuracy in his dream computer. ”

“ High-speed analog storage permits the machine to make sequential calculations, a job once reserved for the digital computer. But even these advances cannot offset the basic limitations the analog computer is heir to.
84Fewer analog machines are being built now, and many in existence do not enjoy the busy schedule of the digital machines. As the mountains of data pile up, created incidentally by computers in the first place, more computers are needed to handle and make sense of them. It is easier to interpret, store, and transmit digital information than analog ”

“ Term used to refer to a well-known effect whereby function in a computing system family is migrated out to special-purpose peripheral hardware for speed, then the peripheral evolves toward more computing power as it does its job, then somebody notices that it is inefficient to support two asymmetrical processors in the architecture and folds the function back into the main CPU, at which point the cycle begins again. Several iterations of this cycle have been observed in graphics-processor design, and at least one or two in communications and floating-point processors. ”

“ When you prefer an extra-large, extra-sharp screen and giant memory and when you can’t easily find micros of comparable quality. Here, too, I’m skeptical. The gap between micro hardware and the dedicateds is narrowing.
5. When you’re looking for a machine that will run special software that the micros won’t. Fondly, a Hollywood writer-director tells of a script-formating program “dreamed up by some lunatic in northern California.” Nowadays, however, moremore programmers are writing for micros than for dedicated word processors. ”

“ According to Top500.org, a web site that tracks the most powerful supercomputers in the world, the IBM SP Power3 supercomputer housed within the MHPCC clocks in at 837 billion floating-point operations per second, making it one of 25 most powerful computers in the world. Co-owned and operated by the University of Hawaii and the U.S. Air Force, the machine divides its computer cycles between the number crunching tasks associated with military logistics and high-temperature physics research. ”

“ Just as important as the hardware—the computers and other machines—are the programs on those plastic disks. In fact, you should even think “software” before you do hardware, because your machine will be useless if it doesn’t do the tasks you want it to. And the programs supply these necessary instructions. More than thirty thousand programs for micros are on the market; so The Silicon Jungle can’t say which one is exactly right for you, but it can help you find out for yourself by showing how a software classic comes into existence. ”

“ In many cases, especially where typical standard operations are involved, it is preferable to use external devices to handle preliminary selection and sorting of events, rather than to ask the computer to do the entire job. For example, particle identification by use of signals from two counters involves one or two multiplications and additions, which can be carried out almost instantly by a fairly simple external analog device, whereas a small computer would likely require at least 500 μsec for the job, assuming calculation, and perhaps 40 μsec, assuming table look-up. ”

“ With these tiny components and new circuit modes a supercomputer could be built, stored with information, and programmed to solve what one of the participants called the most difficult problem the human being faces today—that of bargaining.
This computer has not yet been built; it won’t be for some time. But design and fabrication are moving in that direction on a number of fronts. One of these fronts is that of hardware, the components used in building up the computer circuitry. In a decade we moved from vacuum tubes to transistors to thin-film 252devices. ”

“ In effect, we have changed $5 words into four-bit words! The computer couldn’t care less, since it handles binary digits at the rate of millions a second; and the human is better able to keep his marbles while he works with the computer. Of course, there are some computers that are classed as pure binary machines. These work on mathematical problems, with none of the restrictions imposed by human frailty. For the computer the pure binary system is more efficient than the binary decimal compromise.
The four-digit words can be made to represent not only numbers, but letters as well. ”

“ That will change as special programs come out for the 16-bit machines and as old ones, like WordStar, begin to take full advantage of 16-bit capabilities. Already Apple and other companies are writing new software for computers like the Macintosh, which, if not universally regarded as a true 32-bit machine, contains chips faster than the IBM’s 8088.
For many small businesses, however, 8 bits may be powerful enough even for number crunching as long as the right programs are available.
The wisdom in the micro business is that no machine is ever obsolete—just so it does the job for you. ”