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HandWiki. Base 16 Floating Point. Encyclopedia. Available online: https://encyclopedia.pub/entry/37425 (accessed on 23 September 2026).
HandWiki. Base 16 Floating Point. Encyclopedia. Available at: https://encyclopedia.pub/entry/37425. Accessed September 23, 2026.
HandWiki. "Base 16 Floating Point" Encyclopedia, https://encyclopedia.pub/entry/37425 (accessed September 23, 2026).
HandWiki. (2022, December 01). Base 16 Floating Point. In Encyclopedia. https://encyclopedia.pub/entry/37425
HandWiki. "Base 16 Floating Point." Encyclopedia. Web. 01 December, 2022.
Base 16 Floating Point
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The content is sourced from: https://handwiki.org/wiki/Base_16_floating_point

IBM System/360 computers, and subsequent machines based on that architecture (mainframes), support a hexadecimal floating-point format (HFP). In comparison to IEEE 754 floating-point, the IBM floating-point format has a longer significand, and a shorter exponent. All IBM floating-point formats have 7 bits of exponent with a bias of 64. The normalized range of representable numbers is from 16−65 to 1663 (approx. 5.39761 × 10−79 to 7.237005 × 1075). The number is represented as the following formula: (−1)sign × 0.significand × 16exponent−64.

hexadecimal floating-point mainframes

References

  1. ESA/390 Enhanced Floating Point Support: An Overview ftp://public.dhe.ibm.com/software/websphere/awdtools/hlasm/sh93fpov.pdf
  2. Schwarz, E. M.; Krygowski, C. A. (September 1999). "The S/390 G5 floating-point unit". IBM Journal of Research and Development 43 (5.6): 707–721. doi:10.1147/rd.435.0707.  https://dx.doi.org/10.1147%2Frd.435.0707
  3. Duale, A. Y.; Decker, M. H.; Zipperer, H.-G.; Aharoni, M.; Bohizic, T. J. (January 2007). "Decimal floating-point in z9: An implementation and testing perspective". IBM Journal of Research and Development 51 (1.2): 217–227. doi:10.1147/rd.511.0217.  https://dx.doi.org/10.1147%2Frd.511.0217
  4. Heller, L. C.; Farrell, M. S. (May 2004). "Millicode in an IBM zSeries processor". IBM Journal of Research and Development 48 (3.4): 425–434. doi:10.1147/rd.483.0425.  https://dx.doi.org/10.1147%2Frd.483.0425
  5. Schwarz, E. M.; Kapernick, J. S.; Cowlishaw, M. F. (January 2009). "Decimal floating-point support on the IBM System z10 processor". IBM Journal of Research and Development 53 (1): 4:1–4:10. doi:10.1147/JRD.2009.5388585.  https://dx.doi.org/10.1147%2FJRD.2009.5388585
  6. z/Architecture Principles of Operation http://publibfp.boulder.ibm.com/epubs/pdf/dz9zr011.pdf
  7. "The Record Layout of a Data Set in SAS Transport (XPORT) Format". http://support.sas.com/techsup/technote/ts140.pdf. 
  8. http://www.seg.org/documents/10161/77915/seg_y_rev1.pdf
  9. https://cran.r-project.org/web/packages/SASxport/SASxport.pdf
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