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computers / alt.folklore.computers / Re: The TC-16 and Model 709: A Unique Floating-Point Format

SubjectAuthor
* The TC-16 and Model 709: A Unique Floating-Point FormatQuadibloc
+* Re: The TC-16 and Model 709: A Unique Floating-Point FormatScott Lurndal
|`* Re: The TC-16 and Model 709: A Unique Floating-Point FormatQuadibloc
| `* Re: The TC-16 and Model 709: A Unique Floating-Point FormatBob Eager
|  +* Re: The TC-16 and Model 709: A Unique Floating-Point FormatQuadibloc
|  |`* Re: The TC-16 and Model 709: A Unique Floating-Point FormatRobin Vowels
|  | `- Re: The TC-16 and Model 709: A Unique Floating-Point FormatQuadibloc
|  +* Re: The TC-16 and Model 709: A Unique Floating-Point FormatQuadibloc
|  |`* Re: The TC-16 and Model 709: A Unique Floating-Point FormatBob Eager
|  | `* Re: The TC-16 and Model 709: A Unique Floating-Point FormatQuadibloc
|  |  `* Re: The TC-16 and Model 709: A Unique Floating-Point FormatBob Eager
|  |   `* Re: The TC-16 and Model 709: A Unique Floating-Point FormatQuadibloc
|  |    `* Re: The TC-16 and Model 709: A Unique Floating-Point FormatBob Eager
|  |     +* Re: The TC-16 and Model 709: A Unique Floating-Point FormatQuadibloc
|  |     |+* Re: The TC-16 and Model 709: A Unique Floating-Point FormatBob Eager
|  |     ||`- Re: The TC-16 and Model 709: A Unique Floating-Point FormatPeter Flass
|  |     |`* Re: Math libraries, was The TC-16 and Model 709: A Unique Floating-Point FormatJohn Levine
|  |     | +- Re: Math libraries, was The TC-16 and Model 709: A UniqueQuadibloc
|  |     | `- Re: Math libraries, was The TC-16 and Model 709: A UniqueRobin Vowels
|  |     +* Re: The TC-16 and Model 709: A Unique Floating-Point FormatRobin Vowels
|  |     |`- Re: The TC-16 and Model 709: A Unique Floating-Point FormatQuadibloc
|  |     `- Re: The TC-16 and Model 709: A Unique Floating-Point FormatRobin Vowels
|  +- Re: The TC-16 and Model 709: A Unique Floating-Point FormatPeter Flass
|  `- Re: The TC-16 and Model 709: A Unique Floating-Point FormatJohn Levine
`* Re: The TC-16 and Model 709: A Unique Floating-Point FormatRobin Vowels
 `* Re: The TC-16 and Model 709: A Unique Floating-Point FormatQuadibloc
  `- Re: The TC-16 and Model 709: A Unique Floating-Point FormatQuadibloc

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Re: The TC-16 and Model 709: A Unique Floating-Point Format

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Subject: Re: The TC-16 and Model 709: A Unique Floating-Point Format
From: robin.vowels@gmail.com (Robin Vowels)
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 by: Robin Vowels - Sun, 23 May 2021 02:25 UTC

On Sunday, May 23, 2021 at 6:01:59 AM UTC+10, Bob Eager wrote:
> On Sat, 22 May 2021 10:15:01 -0700, Quadibloc wrote:
>
> As I understand it (you will know) the IBM 370 etc. format has some
> problems with maintaining accuracy, and they had to engineer special math
> libraries to help with that.
..
The IBM 370 introduced an improved HER and HDR instruction that
normalised after the halving process.

Re: The TC-16 and Model 709: A Unique Floating-Point Format

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Subject: Re: The TC-16 and Model 709: A Unique Floating-Point Format
From: jsavard@ecn.ab.ca (Quadibloc)
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 by: Quadibloc - Sun, 23 May 2021 09:42 UTC

On Saturday, May 22, 2021 at 8:16:15 PM UTC-6, Robin Vowels wrote:

> IBM modified the 360 hardware to include a guard digit for floating-point.

Yes. That modification took place very shortly after the 360 was released,
because it turned out that the behavior of FP without a guard digit on the
initial machines was disastrous.

Even with the guard digit, with a hex exponent, and with truncation instead
of rounding, IBM floating-point was not the greatest, and so care in numerical
analysis was required with it. Of course, the Cray I was even worse, and the
MANIAC II hardly bears thinking of.

John Savard

computers / alt.folklore.computers / Re: The TC-16 and Model 709: A Unique Floating-Point Format

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