![]() ![]() Typically binary computers with word size up to 36 bits had one instruction per word, binary computers with 48 bits per word had two instructions per word and the CDC 60-bit machines could have two, three, or four instructions per word, depending on the instruction mix the Burroughs B5000, B6500/B7500 and B8500 lines are notable exceptions to this.įirst-generation computers with data channels (I/O channels) had a basic DMA interface to the channel cable. All but the smallest machines had asynchronous I/O channels and interrupts. The most common word sizes for binary mainframes were 36 and 48 bits, although entry-level and midrange machines used smaller words, e.g., 12 bits, 18 bits, 24 bits, 30 bits. With the advent of the IBM System/360, two's complement became the norm for new product lines. The second-generation computer architectures initially varied they included character-based decimal computers, sign-magnitude decimal computers with a 10-digit word, sign-magnitude binary computers, and ones' complement binary computers, although Philco, RCA, and Honeywell, for example, had some computers that were character-based binary computers and Digital Equipment Corporation (DEC) and Philco, for example, had two's complement computers. Meanwhile, second-generation computers were also being developed in the USSR as, e.g., the Razdan family of general-purpose digital computers created at the Yerevan Computer Research and Development Institute. ![]() Also, towards the end of the second generation Digital Equipment Corporation (DEC) was a serious contender in the small and medium machine marketplace. However, some smaller companies made significant contributions. the RCA 301, 3301 and the Spectra 70 series.the GE-400 series and the GE-600 series.the Honeywell 200, Honeywell 400, and Honeywell 800.Some examples of 1960s second generation computers from those vendors are: The marketplace was dominated by IBM and the seven dwarfs: By 1960 transistorized computers were replacing vacuum tube computers, offering lower cost, higher speeds, and reduced power consumption. ( August 2020)įor the purposes of this article, the term "second generation" refers to computers using discrete transistors, even when the vendors referred to them as "third-generation". These advances led to the miniaturized personal computer (PC) in the 1970s, starting with home computers and desktop computers, followed by laptops and then mobile computers over the next several decades. This led to primary computer memory moving away from magnetic-core memory devices to solid-state static and dynamic semiconductor memory, which greatly reduced the cost, size, and power consumption of computers. Metal–oxide–semiconductor (MOS) large-scale integration (LSI) technology subsequently led to the development of semiconductor memory in the mid-to-late 1960s and then the microprocessor in the early 1970s. Around 1953 to 1959, discrete transistors started being considered sufficiently reliable and economical that they made further vacuum tube computers uncompetitive. It is solely up to theĮnd user to decide that the information and files offered here are accurate and fit for use with their equipment.The history of computing hardware starting at 1960 is marked by the conversion from vacuum tube to solid-state devices such as transistors and then integrated circuit (IC) chips. There is no guarantee of the accuracy of any information offered. The data and files offered here are from vintage sources that are no longer published. I stock over 500,000 schematics for hundreds of manufacturers.Įach radio schematic is digitized individually and checked to provide the clearest diagram possible from the original printing. The files offered here are digitized in high resolution from the original factory service documents. GE Factory Schematics - Models/Chassis Available:įor GE Service Manuals see the GE Service Manual section.įor more GE schematics see the Basic Schematics section. General Electric Factory Schematics 1946 -1961 It normally takes up to 24 hours to receive the download instructions via email but please allow 1 - 2 business days. If you still can't find your model or chassis contact me for availability. If your model or chassis is not listed below, full GE radio service manuals can be found for most 1930 through 1950s GE models here.įor basic schematics for General Electric models not listed below you can also check the Basic Schematics section. They are scanned in high resolution directly from the original GE Factory Radio Service Guides. These files contain the schematic and parts list published by General Electric for service technicians. These are General Electric (U.S.A) schematics with parts lists for GE radio models manufactured in the U.S. ![]() General Electric Factory Schematics 1946 - 1965
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