miller@loral.UUCP (David P. Miller) (12/10/85)
I need some information on the floating point format of the Data General ECLIPSE type 32-bit (MV-10000) Computers. I tried contacting the local Data General office but all they seemed interested in was a P.O. so they could answer my question. All I'm trying to do is to obtain some hexidecimal notation information in order to generate an algorithm to convert from DG format into IEEE 488. Examples of what the sign bit, mantissa, and exponent for the following data would do: 0.5 X 2^127 -0.5 X 2^127 0.5 X 2^-128 -0.5 X 2^-128 Does anyone out there in the netland know this information or at least know of place where I can obtain it without being gouged and/or waiting six weeks for ?
miller@loral.UUCP (David P. Miller) (12/11/85)
In order to help a colleague of mine finish his project, I'm trying to obtain
floating point format info for the Data General ECLIPSE 32-bit computer,
specifically for the MV10000 model. All he needs to do is to obtain the hexi-
decimal notation for four different numbers in order to generate an algorithm
to convert data from ECLIPSE format to IEEE 488 format and viceversa.
In contacting the Data General local office we learned that in order to do
that they needed a P.O. and several weeks lead time from us in order to come
up with the answer. Now, come on guys !!. All that time and money for four
different numbers ??. It seems to me I've seen similar information published in
MIL-STD-1750, but not in any DG literature.
What we need is the bit pattern (sign bit,mantissa,and exponent) for the
numbers listed bellow:
0.5 X 2^127 -0.5 X 2^127
0.5 X 2^-128 -0.5 X 2^-128
Does anyone out there know where I could obtain this info expeditiously, or
know what the resultant numbers might be ??. I would greatly appreciate any
help given to me in this matter.
Thanks in advance, BIG DAVE.
David P. Miller - Loral Instrumentation.
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"From the Copa, Copacabana the hottest spot south of Havana ........"
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0.5 X 2^johnl@ima.UUCP (12/11/85)
/* Written 6:41 pm Dec 9, 1985 by miller@loral in ima:net.micro */ > I need some information on the floating point format of the Data General > ECLIPSE type 32-bit (MV-10000) Computers. I tried contacting the local > Data General office but all they seemed interested in was a P.O. so they > could answer my question. Your local DG office must be woefully underinformed. DG has always used exactly the same floating point format as the IBM 360/370 series, that is 1-bit sign, 7-bit exponent, and 6 (float) or 14 (double) hex digits of fraction. The exponent is excess-64, and is powers of 16 not of 2. The 360 floating point format is well-known if not well-liked. John Levine, ima!johnl
zadco@ssc-vax.UUCP (Rick Fairfield) (12/16/85)
> In order to help a colleague of mine finish his project, I'm trying to obtain > floating point format info for the Data General ECLIPSE 32-bit computer ... BIG DAVE: I have the information that you need but I am unable to mail to your site. Call me at the number below (or post your mailing address) and I will send you the info. R. C. Fairfield Boeing Aerospace Co. (206) 773-1004 ... ssc-vax!zadco