In a message dated 05/06/03 03:02:54 GMT Daylight Time, [EMAIL PROTECTED] writes:
BTW, I've read that Quanta published some IEEE-QDOS FP conversion
routines in the past (might have been quite some time ago). Does
anybody remember this and can scan me a copy?
The program FPSAVE which allows an
[EMAIL PROTECTED] wrote:
The program FPSAVE which allows an FPU to be used if present (eg on
Q40/60) contains the two routines IEEE QDOS fp. I have recently
used these but not, to my knowledge, on the tricky -1+0 numbers.
I have seen them in FPSP and IIRC they should exhibit the same
On Wed, 18 Jun 2003 at 08:36:41, Norman Dunbar wrote:
(ref:
[EMAIL PROTECTED])
Hi Roy,
90% of the time, when you do this, it is OK - on the odd occasion though
the mixture of Air to gas is just right to explode in the bunsen burner.
CO2 mainly - so no explosion.
All it did was make the
by: Subject: Re: [ql-users] is minus one =
-1?
[EMAIL PROTECTED]
g.uk
Well, I don't think it was so much a mispelling (i knew how to spell
it an
caught it as soon as I sent the email) as a sort of typo, I just did
it
again in another email elsewhere. I think I can't catch the 2nd m
when
typing for some reason maybe I should slow down a bit!!
The spell
-FS.com
-
-Original Message-
From: Tony Firshman [mailto:[EMAIL PROTECTED]
Sent: Sunday, June 15, 2003 10:08 PM
To: [EMAIL PROTECTED]
Subject: Re: [ql-users] is minus one = -1?
The best trick is to blow into the gas pipe in chemistry labs.
This causes
]
Subject: Re: [ql-users] is minus one = -1?
. my beloved second wife decided to purge some of
my past life junk. This included some of the less useful calculaters,
some broke, some given away, some got flat batteries (including
unfortunately the great little Casio with clever calculator games
, 2003 8:08 AM
Subject: RE: [ql-users] is minus one = -1?
Morning Dilwyn,
Women eh - they always accuse us menfolk of having so much junk, then you
walk into the bathroom and find .
8,000 assorted bottled of gunk (not the engine cleaner) each of which has
a
purpose and is really needed
Women eh - they always accuse us menfolk of having so much junk,
then you
walk into the bathroom and find .
8,000 assorted bottled of gunk (not the engine cleaner) each of
which has a
purpose and is really needed for some reason or other. Men have
soap,
shampoo and maybe after shave.
-
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Monday, June 16, 2003 11:51 AM
To: [EMAIL PROTECTED]
Subject: Re: [ql-users] is minus one = -1?
I also remeber when he was standing on a stepladder getting bits from the
attic hatch, he reached up to grab
- Original Message -
From: Norman Dunbar [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Monday, June 16, 2003 8:08 AM
Subject: RE: [ql-users] is minus one = -1?
Morning Dilwyn,
Women eh - they always accuse us menfolk of having so much junk, then
you
walk into the bathroom and find
Darren.Branagh writes:
I just spelt 'remember' wrongly TWICE in that email. I'm getting old.
My spellings gone down the drain, too (in three languages) I started
spelling remeber just like you, so now I keep a lookout for that word (among
others) and usually catch it. Old age, you think? Whats
On Sun, 15 Jun 2003 at 09:03:22, Robert Newson wrote:
(ref: [EMAIL PROTECTED])
Dilwyn Jones wrote:
Tony Tebby wrote:
You son would do fine here (in France). My son has just taken his
French
essay paper for the baccalauriat. This year the French paper has
Calculators not allowed for this
Tony Firshman wrote:
You son would do fine here (in France). My son has just taken his
French
essay paper for the baccalauriat. This year the French paper has
Calculators not allowed for this paper in big letters on the
front - apparently French schoolchildren (sorry - young adult
students) are
Robert Newson wrote:
Years ago when I was doing my O-Levels, they introduced a calculator
exam in
maths that I took. It stated on the front of that paper that
approved
calculators were allowed, but NOT slide rules. All we could ask
was what
advantage does a slide rule have over a calculator
On Sun, 15 Jun 2003 at 21:00:52, Robert Newson wrote:
(ref: [EMAIL PROTECTED])
The slide rule I used as school was my dad's old one which even had
inches and centimetres marked down the opposite long edges (it was a
12 rule).
My brother, a doctor, when her was a student used to keep a 6 rule
Dilwyn Jones wrote
Last time Floating Point Theory came up in my case was a few years ago
when my son threw one of my (at the time numerous) calculators down a
toilet...Point was it didn't Float ;-)
Not quite sure why he did it, he was only about 2 years old at the
time and doesn't
Tony Tebby wrote:
You son would do fine here (in France). My son has just taken his
French
essay paper for the baccalauriat. This year the French paper has
Calculators not allowed for this paper in big letters on the
front -
apparently French schoolchildren (sorry - young adult students) are
Hi Dilwyn,
Last time Floating Point Theory came up in my case was a few years ago
when my son threw one of my (at the time numerous) calculators down a
toilet...Point was it didn't Float ;-)
is this the reason why you no longer have numerous calculators then ?
Cheers,
Norman.
Morning Bill,
you said :
did'nt understand a word of this thread
I'm glad is wasn't just me then. I've never got to grips with all that
floating point malarky - even when we were 'taught' it in school.
I wonder if there is a web site, or a download somewhere out there (I've not
come
Norman Dunbar wrote:
We need The Idiot's Guide to Floating Point Number Theory I think
!
Eek, I'm scared already...
Last time Floating Point Theory came up in my case was a few years ago
when my son threw one of my (at the time numerous) calculators down a
toilet...Point was it didn't Float ;-)
On Thu, 12 Jun 2003 at 18:36:25, Dilwyn Jones wrote:
(ref: [EMAIL PROTECTED])
Norman Dunbar wrote:
We need The Idiot's Guide to Floating Point Number Theory I think
!
Eek, I'm scared already...
Last time Floating Point Theory came up in my case was a few years ago
when my son threw one of my
- Original Message -
From: P Witte [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Wednesday, June 11, 2003 1:24 PM
Subject: Re: [ql-users] is minus one = -1?
Lau writes:
Tony Firshman wrote:
On Tue, 10 Jun 2003 at 00:43:13, Lau wrote:
(ref: [EMAIL PROTECTED
Lau wrote:
The history is documented here
http://www.cs.berkeley.edu/~wkahan/ieee754status/754story.html
Superb link... thanks. (How the hell did you find it?).
Using the usual keywords ieee floating point history and the magic
one, intel ;-)
Marcel
Tony Firshman wrote:
The history is documented here
http://www.cs.berkeley.edu/~wkahan/ieee754status/754story.html
Can someone please define Gradual Underflow.
I might be mistaken (as usual ;), but as I understand it that's the
denormalised numbers we have discussed here, i.e. when the
P Witte wrote:
While were talking fp, can someone please explain what the purpose of
the
$81f bias (or whatever the technical term) is? Why not just represent
exponents as +/-32k ?
Per
Lau replied
It's a bit historic, I suspect.
More than that, it is very historic!
The
TonyTebby wrote:
I have always suspected that IEEE format was defined by a committee
whose primary object was to ensure that standard floating point
numbers could not be handled efficiently in either software or
microcoded hardware using simple integer operations. The idea being
to force the
P Witte wrote:
TonyTebby writes:
The 68xxx series is 16 bit word oriented (even on the 68008 8 bit bus
version) so a whole word exponent makes sense.
But, by using only 12 bits for the exponent (enough for astonomical
callculations) the 4 MSBs can be used as the floating point number token
flag
Marcel Kilgus wrote:
The history is documented here
http://www.cs.berkeley.edu/~wkahan/ieee754status/754story.html
Superb link... thanks. (How the hell did you find it?).
PS. After having a quick shot at Google to see if I could get to your
link location, I did hit this one:
Lau writes:
P Witte wrote:
While were talking fp, can someone please explain what the purpose of
the
$81f bias (or whatever the technical term) is? Why not just represent
exponents as +/-32k ?
Per
It's a bit historic, I suspect.
It allows all operations on the exponent to be
Lau writes:
P Witte wrote:
While were talking fp, can someone please explain what the purpose of
the
$81f bias (or whatever the technical term) is? Why not just represent
exponents as +/-32k ?
Per
It's a bit historic, I suspect.
It allows all operations on the exponent to be
While were talking fp, can someone please explain what the purpose of the
$81f bias (or whatever the technical term) is? Why not just represent
exponents as +/-32k ?
Per
P Witte wrote:
While were talking fp, can someone please explain what the purpose of the
$81f bias (or whatever the technical term) is? Why not just represent
exponents as +/-32k ?
Per
It's a bit historic, I suspect.
It allows all operations on the exponent to be done with unsigned
Marcel Kilgus wrote:
TonyTebby wrote:
I hardly dare to disagree with Marcel but I would describe it as a bug.
Oh well, if you wouldn't dare, who would? ;-)
I'd dare...
It's a bug.
Although I would guess that no official documentation might state
categorically that numbers are supposed to be
- Original Message -
From: Marcel Kilgus [EMAIL PROTECTED]
To: ql-users [EMAIL PROTECTED]
Sent: mardi 3 juin 2003 21:52
Subject: Re: [ql-users] is minus one = -1?
P Witte wrote:
In internal format, Exponent . Mantissa:
-1= $800 . $C000
-1 + 0 = $801 . $8000
TonyTebby wrote:
I hardly dare to disagree with Marcel but I would describe it as a bug.
Oh well, if you wouldn't dare, who would? ;-)
It would not be a bug on any other system because as Marce rightly
says In University one gets taught to NEVER EVER try to compare two
FP values using the
P Witte wrote:
A question to my learned friends:
In Smsq -1 (-1 + 0)
In internal format, Exponent . Mantissa:
-1= $800 . $C000
-1 + 0 = $801 . $8000
which can be a flaming nuisance!
However,
-1 == (-1 + 0)
which is some relief!
This behaviour appears to apply to all
P Witte wrote:
In internal format, Exponent . Mantissa:
-1= $800 . $C000
-1 + 0 = $801 . $8000
which can be a flaming nuisance!
You got the mantissas and exponents mixed up, $800 $8000 is -1
and $801 $C000 is -1 but not your two. As Robert wrote this is a
question
Robert Newson writes:
Does it happen on all negative exact powers of 2, ie:
-(2^x) -(2^x) + 0
for x = 0, 1, 2, 3, ... (ie -1, -2, -4, -8, -16, etc)?
Youre right. Take the program:
for i=0 to 16:print i!-i=(-i+0)
The results are:
Smsq/e 3.00 Qdos JM/JS/Minerva 1.98
0 1
Marcel Kilgus writes:
In internal format, Exponent . Mantissa:
-1= $800 . $C000
-1 + 0 = $801 . $8000
which can be a flaming nuisance!
You got the mantissas and exponents mixed up, $800 $8000 is -1
and $801 $C000 is -1 but not your two. As Robert wrote this
A question to my learned friends:
In Smsq -1 (-1 + 0)
In internal format, Exponent . Mantissa:
-1= $800 . $C000
-1 + 0 = $801 . $8000
which can be a flaming nuisance!
However,
-1 == (-1 + 0)
which is some relief!
This behaviour appears to apply to all (small?) negative
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