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Y4G came before Y2K

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old account Frank Eory
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re: Y4G came before Y2K
old account Frank Eory   7/26/2010 11:19:57 PM
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"640K ought to be enough for anybody."

webmasterpdx
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re: Y4G came before Y2K
webmasterpdx   7/26/2010 11:10:03 PM
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This was a problem back when nobody thought you'd ever need more than 2G of RAM. Many OS's, including Solaris and Windows were not tested with addresses greater than 2G. The problem was the address became negative, so when adding pointers, things got a bit whacky. All these OS's are fixed today I'm sure as 4G isn't that unreal any more. More than 4G is handled through virtual memory of course (you actually don't need a 64-bit CPU).

blevite
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re: Y4G came before Y2K
blevite   7/26/2010 5:50:22 PM
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I'm reminded of the Therac-25 (?) back in the 80s. One of the flaws mentioned was an overflow in an 8 bit cycle counter for tuning the radiation beam. When the counter rolled-over, it just continued to focus finer and finer. Caused several fatal burns before the machine was pulled and the manufacturer ended up in court.

thebatosai
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re: Y4G came before Y2K
thebatosai   7/25/2010 10:07:43 PM
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Very interesting read. Glad to learn so much from it. Thanks.

dhanhurley
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re: Y4G came before Y2K
dhanhurley   7/25/2010 11:36:32 AM
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Hi from ZÜRICH,SWITZERLAND. "WHAT CAN GO WRONG WILL".IF IT WORKS DO NOT FIX IT. LET US KNEEL ON THE EARTH THIS SUNDAY AND:- HUMBLE OURSELVES, LIFT UP YOUR EYES & HEART, CROSS YOUR FINGERS, AND PRAY, TO SAINT MURPHY. AND WHEN ALL FAILS USE AN "IRISH-SCREWDRIVER". NAMELY A 1 KILO HAMMER Yours "without wax" Dhan Hurley

chazind
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re: Y4G came before Y2K
chazind   7/25/2010 12:57:54 AM
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This article brought back lots of old memories, having worked on a system where we had counter that the documentation said was 64 bits but turned out to be 32 bits which caused our systems to reboot every 540 days. Needless to say tracking that one down was a joy.

rcutshaw725
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re: Y4G came before Y2K
rcutshaw725   7/24/2010 3:53:48 PM
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You have to remember also that the Y2K problem actually started in 1970. That was the year that software used to calculate mortgages started failing.

LJL1
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re: Y4G came before Y2K
LJL1   7/24/2010 7:25:19 AM
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Just because it is "rare" or "unlikely" does not mean it won't happen. I try never to forget that when designing HW or SW.

Duane Benson
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re: Y4G came before Y2K
Duane Benson   7/21/2010 4:27:48 PM
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This reminds me of an article I read a few years ago about a flight of 12 F-22 fighters losing their brains when crossing the International dateline on a flight between Hawaii and Okinawa. And, back in the early days of the PC era, most PCs shipped with 64K or 128K of RAM. (Yes, that's "K") The box was capable of holding up to 640K of RAM total but quite a few software applications crashed if the computer had more the 512K installed due to a roll-over error. Never take anything for granted when dealing with mins and maxs.

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