Decimal floating point on x86 and ARM?

By: David Hess (davidwhess.delete@this.gmail.com), December 22, 2020 1:05 pm
Room: Moderated Discussions
Konrad Schwarz (no.spam.delete@this.no.spam) on December 22, 2020 12:04 am wrote:
> David Hess (davidwhess.delete@this.gmail.com) on December 21, 2020 6:15 pm wrote:
> >
> > They might have had applications in the same embedded market that made use of BCD support
> > in the 8080 except for the high cost of the 8087 and the existing sufficient integer
> > BCD support. I am not sure if I would have used 8087 BCD even if available.
>
> I think it is pretty clear it was intended for COBOL support. Allows you to store the data in "native"
> COBOL format but arithmetic was done in binary, once the data had been loaded into the x87.
>
> Whereas the x87 BCD was probably intended for the logic backing e.g. decimal (LED) displays.

It was not only BCD driven displays. At the time of the 8080 to 8086 transition, a lot of hardware was natively BCD including converters and counters.
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TopicPosted ByDate
Decimal floating point on x86 and ARM?anon2020/12/18 09:29 AM
  Decimal floating point on x86 and ARM?Per Hesselgren2020/12/18 10:16 AM
    Decimal floating point on x86 and ARM?anon2020/12/18 12:23 PM
      Decimal floating point on x86 and ARM?dmcq2020/12/18 06:18 PM
  Decimal floating point on x86 and ARM?rwessel2020/12/18 07:57 PM
    Decimal floating point on x86 and ARM?dmcq2020/12/19 04:41 AM
      Decimal floating point on x86 and ARM?rwessel2020/12/19 08:54 AM
        Decimal floating point on x86 and ARM?Michael S2020/12/19 10:48 AM
          Decimal floating point on x86 and ARM?rwessel2020/12/20 09:25 AM
            Decimal floating point on x86 and ARM?blaine2020/12/20 11:52 AM
              Decimal floating point on x86 and ARM?rwessel2020/12/20 01:44 PM
                Decimal floating point on x86 and ARM?blaine2020/12/20 05:29 PM
              Decimal floating point on x86 and ARM?Konrad Schwarz2020/12/21 04:17 AM
            Decimal floating point on x86 and ARM?Adrian2020/12/21 10:05 AM
  Decimal floating point on x86 and ARM?Konrad Schwarz2020/12/20 09:47 AM
    Decimal floating point on x86 and ARM?rwessel2020/12/20 11:28 AM
    Decimal floating point on x86 and ARM?Linus Torvalds2020/12/20 11:39 AM
      Decimal floating point on x86 and ARM?dmcq2020/12/20 12:06 PM
        Decimal floating point on x86 and ARM?Konrad Schwarz2020/12/21 03:31 AM
          Decimal floating point on x86 and ARM?Brendan2020/12/21 05:49 AM
            Decimal floating point on x86 and ARM?dmcq2020/12/21 07:59 AM
      Decimal floating point on x86 and ARM?Adrian2020/12/21 09:51 AM
        Decimal floating point on x86 and ARM?Linus Torvalds2020/12/21 12:12 PM
          Decimal floating point on x86 and ARM?Adrian2020/12/21 01:29 PM
          Decimal floating point on x86 and ARM?dmcq2020/12/21 04:13 PM
      Decimal floating point on x86 and ARM?David Hess2020/12/21 07:15 PM
        Decimal floating point on x86 and ARM?Konrad Schwarz2020/12/22 01:04 AM
          Decimal floating point on x86 and ARM?David Hess2020/12/22 01:05 PM
    Decimal floating point on x86 and ARM?blaine2020/12/20 12:40 PM
      Decimal floating point on x86 and ARM?Per Hesselgren2020/12/21 04:33 AM
        Decimal floating point on x86 and ARM?rwessel2020/12/21 06:17 AM
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