page_title: IBM 308X
hierarchical_section_title: IBM 308X
caption_attribution_description: Transformer read-only store (TROS) from an IBM S/360 Model 40. Thin films with a grid of wire traces on them which worked basically like core memory -- holes could be punched through the traces to only allow electricity to flow one direction around each core, thereby representing a 0 or a 1.
context_page_description: The IBM 308X was a line of mainframe computers, the first model of which, the Model 3081 Processor Complex, was introduced November 12, 1980. It consisted of a 3081 Processor Unit with supporting units.
  Later models in the series were the 3083 and the 3084. The 3083 was announced March 31 and the 3084 on September 3, both in 1982.
  The IBM 308X line introduced the System/370 Extended Architecture.
  All three 308X systems, which IBM had marketed as "System/370-Compatibles," were withdrawn August 4, 1987.
context_section_description: The IBM 308X was a line of mainframe computers, the first model of which, the Model 3081 Processor Complex, was introduced November 12, 1980. It consisted of a 3081 Processor Unit with supporting units.
  Later models in the series were the 3083 and the 3084. The 3083 was announced March 31 and the 3084 on September 3, both in 1982.
  The IBM 308X line introduced the System/370 Extended Architecture.
  All three 308X systems, which IBM had marketed as "System/370-Compatibles," were withdrawn August 4, 1987.
caption: Technology has progressed enormously from the above read-only storage to the subsequent writeable control storage
exif: {"Image Make": "Canon", "Image Model": "Canon EOS REBEL T2i", "Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image DateTime": "2013:11:03 14:48:43", "Image Artist": "", "Image YCbCrPositioning": "Co-sited", "Image Copyright": "", "Image ExifOffset": "348", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "8736", "Thumbnail JPEGInterchangeFormatLength": "13803", "EXIF ExposureTime": "1/60", "EXIF FNumber": "5/2", "EXIF ExposureProgram": "Program Normal", "EXIF ISOSpeedRatings": "200", "EXIF ExifVersion": "0221", "EXIF DateTimeOriginal": "2013:11:03 14:48:43", "EXIF DateTimeDigitized": "2013:11:03 14:48:43", "EXIF ComponentsConfiguration": "YCbCr", "EXIF ShutterSpeedValue": "6", "EXIF ApertureValue": "21/8", "EXIF ExposureBiasValue": "-1/3", "EXIF MeteringMode": "Pattern", "EXIF Flash": "Flash did not fire, compulsory flash mode", "EXIF FocalLength": "50", "EXIF SubSecTime": "00", "EXIF SubSecTimeOriginal": "00", "EXIF SubSecTimeDigitized": "00", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "5184", "EXIF ExifImageLength": "3456", "Interoperability InteroperabilityIndex": "R98", "Interoperability InteroperabilityVersion": "[48, 49, 48, 48]", "EXIF InteroperabilityOffset": "8596", "EXIF FocalPlaneXResolution": "1036800/181", "EXIF FocalPlaneYResolution": "691200/119", "EXIF FocalPlaneResolutionUnit": "2", "EXIF CustomRendered": "Normal", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF SceneCaptureType": "Standard"}