File:IBM 2315 disk cartridge.agr.jpg
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Summary
Camera location | 37° 24′ 50.4″ N, 122° 04′ 39.6″ W | View this and other nearby images on: OpenStreetMap | 37.414000; -122.077667 |
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DescriptionIBM 2315 disk cartridge.agr.jpg |
English: IBM 2315 disk cartridge used in the IBM 1130 computer, at the Computer History Museum |
Date | |
Source | Own work |
Author | ArnoldReinhold |
IBM 2315 Cartridge storage capacity
Both the IBM 1130 and
the IBM System/360 Model 44 had an integrated disk drive,
the IBM 2310. The IBM 2310's disk cartridge is the IBM 2315.
The internal formatting of the 2315 on each system was different, and the 360/44 could store 1,171,200 characters
[1][2],
whereas the 1130 stored 1,024,00 characters
[3]
[4]
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- ↑ http://bitsavers.trailing-edge.com/pdf/ibm/360/funcChar/A22-6875-5_360-44_funcChar.pdf, page 5. As explained on page 11, each of the 16 sectors in a track hold 366 bytes. 16 x 366 x 200 tracks = 1,171,200 bytes.
- ↑ Contrary to the 1,088,000 "characters" (8 data bits, 1 parity bit) it says about the Integrated Single Disk Storage Drive at https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP2044.html, the IBM 2315 Cartridge used by the IBM 2310 disk drive in the IBM System 360 Model 44, the correct capacity, as cited in the Functional Characteristics manual, is 1,171,200.
- ↑ https://www-03.ibm.com/ibm/history/exhibits/1130/1130_technical.html By contrast, for the IBM 1130 the IBM 2315 Cartridge there are 8 sectors of 640 bytes (320 16-bit words) = 1,024,000 bytes.
- ↑ Both situations involve 200 tracks/cylinders of data. (1130: 512,000 words / 1,024,000 bytes; 360/44: 366 x 16 * 200 = 1,171,200 bytes) HENCE, 1,088,000 is incorrect for the 360/44.
Items portrayed in this file
depicts
28 January 2012
37°24'50"N, 122°4'41"W
0.05 second
2.4
4.28 millimetre
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 20:10, 9 February 2012 | 2,584 × 1,026 (654 KB) | ArnoldReinhold |
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Camera manufacturer | Apple |
---|---|
Camera model | iPhone 4S |
Exposure time | 1/20 sec (0.05) |
F-number | f/2.4 |
ISO speed rating | 80 |
Date and time of data generation | 16:01, 28 January 2012 |
Lens focal length | 4.28 mm |
Latitude | 37° 24′ 50.4″ N |
Longitude | 122° 4′ 39.6″ W |
Altitude | 8.925 meters above sea level |
JPEG file comment | AppleMark |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | QuickTime 7.6.6 |
File change date and time | 14:57, 9 February 2012 |
Y and C positioning | Centered |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 16:01, 28 January 2012 |
Meaning of each component |
|
Shutter speed | 4.3219284603421 |
APEX aperture | 2.5260688216893 |
APEX brightness | 3.3691318327974 |
Metering mode | Pattern |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Focal length in 35 mm film | 35 mm |
Scene capture type | Standard |
Sharpness | Normal |
GPS time (atomic clock) | 00:01:3444 |
Reference for direction of image | True direction |
Direction of image | 266.15363881402 |