By Anthony Hassitt and Anthony Ralston (Auth.)
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Extra info for Computer Programming and Computer Systems
Had we chosen a machine like the IBM 360 as the first example, it would subsequently be found that much of the discussion would be irrelevant to other machines such as the CDC 6600. The IBM 7090 has been chosen because it has a simple structure and most of what is said is relevant to the description of any other large computer. 2-2 2 MACHINE LANGUAGE AND ASSEMBLY LANGUAGE THE MEMORY In this chapter we shall consider only the central part of the computer, namely the CPU and the memory. The memory contains numbers and instructions.
In the IBSYS system IOEX is entered whenever a READ, a WRITE or an interrupt occurs. 6 that an interrupt occurs whenever a channel operation ceases. The executable program loses control. IOEX takes control. It checks that the I/O operation was successful. It looks to see if there are any I/O requests which have not yet been initiated. If there are such requests, then it issues the command to the channel and then returns control to the executable program. On the IBM 704, tape units were numbered serially.
One commonly used memory consists of several rotating disks. Each disk contains a large number of circular tracks. A full circle of the 28 1 COMPUTER SYSTEMS disk constitutes one record of about 400 words. The complete disk system can hold about 8,000,000 words. There are several read/write heads associated with each disk, but there are fewer heads than tracks. This means that the head sometimes has to move from track to track. The time to read one record is d + \r + nw, where n is the number of words in the record; r is the time for one revolution of the disk (about 30 milliseconds) ; d is the time for the head to move to the track (anywhere from zero to 200 milliseconds); w is the time to read one word (typically 20 microseconds).