Talk:Cray-3

What logic was implemented in GaAs
Did the Cray-3 use ECL or what logic ? Rod57 (talk) 17:31, 26 October 2008 (UTC)
 * GaAs. 198.123.51.6 (talk) 17:48, 17 March 2009 (UTC)
 * GaAs, sure, but as TTL, ECL, CMOS or what ? - Rod57 (talk) 05:22, 3 January 2016 (UTC)
 * I think GaAs logic circuits are usually nMOS-like. Dicklyon (talk) 06:09, 3 January 2016 (UTC)
 * Thanks. Actually I just found a GaAs source saying : Cray used Capacitor Diode FET logic (CDFL) (It also says the slower Direct-coupled FET logic (DCFL) is similar to NMOS logic.) I've put more at Gallium_arsenide - Rod57 (talk) 06:58, 3 January 2016 (UTC)


 * Good find. Dicklyon (talk) 07:12, 3 January 2016 (UTC)

Compatibility, NOT
The person who wrote the line about the Cray-3 being compatible with the Cray-2 has never run on any more than a single one of Seymour's machines if any. This is a common mistake by on lookers from other architectures. They have no clue about supercomputing. That line needs to be struck. The only thing which would have been vaguely comparable would be the OS. Source code would have had to have been recompiled into new binaries. 66.122.34.11 (talk) 00:47, 9 December 2011 (UTC)


 * You may be right. Do you know any books or manuals or magazines or other WP:RELIABLE sources that discuss the compatibility (or lack of compatibility) between the Cray-2 and the Cray-3?
 * So far, we have a reference in the article that says that, early in the design of the Cray-3, it was *intended* to be compatible with the Cray-2, but we don't yet have any sources that specifically say whether the actual shipped computers were binary compatible or source compatible or not. --DavidCary (talk) 23:53, 25 August 2015 (UTC)

I wrote the Fortran and C runtime libraries for the Cray-3 and the Cray-4 (and I took the photograph of Seymour and the Cray-3 as well as the standalone photo of of the Cray-3 that's on the page). The Cray-3 was ISA compatible with the Cray-2 (in fact, we did our SW development -- including the assembler code -- on the single quadrant Cray-2 snq2 in-house and Cray-2 SN2025 at NERSC). As part of the split-up Cray Computer acquired the rights to the Cray-2, although we never attempted to sell any of them. With 20/20 hindsight, we probably should have - we would have been in a better financial situation if we'd had an income stream. The Cray-4 was *not* ISA compatible with the Cray-2/Cray-3 (no local memory, an actual hardware exchange jump instruction, T registers, some different load/store instructions to use the additional memory paths, and some new vector instructions). By the way, I'd appreciate a credit line on the photographs. Wikipedia certainly has my permission to use them.

-- Steve Gombosi

While I'm at it: CSOS was not "based on Unicos". It was a clean Unix SVR4 port. We started from scratch on the compilers, as well.

-- Steve Gombosi

-- Steve Gombosi

Removed statement
While citing up the article, I removed this statement:

In practice, two of the processors were removed and the machine was used unofficially for some time after that.

I clearly remember reading this, but can no longer find the source. I will re-insert it if I can. Maury Markowitz (talk) 16:28, 20 October 2016 (UTC)

External links modified
Hello fellow Wikipedians,

I have just modified 1 one external link on Cray-3. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
 * Added archive https://web.archive.org/web/20080507080148/http://www.hoise.com:80/primeur/96/pr-96-oct/CL-PR-10-96-3.html to http://www.hoise.com/primeur/96/pr-96-oct/CL-PR-10-96-3.html

When you have finished reviewing my changes, please set the checked parameter below to true or failed to let others know (documentation at ).

Cheers.— InternetArchiveBot  (Report bug) 04:03, 2 December 2016 (UTC)