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- From: knight@hal.gnu.ai.mit.edu (Knight of Tossing and Turning)
- Subject: AMD-40 Cycle Timing Problems
- Message-ID: <1992Aug15.230511.14243@mintaka.lcs.mit.edu>
- Summary: Probable AMD problem answer
- Keywords: amd cpu
- Sender: news@mintaka.lcs.mit.edu
- Organization: Some, not much.
- Date: Sat, 15 Aug 1992 23:05:11 GMT
- Lines: 24
-
-
- Sorry this took forever to jump into this conversation but I figured it
- wasn't going to freak so many people out.
-
- I was instructed in my PC Archetecture class that the AMD-40 CPU (and
- only that CPU) has a relatively minor problem with timing between
- certain cycles. I'm not sure which combination of instructions causes
- the problem, and I'm not in a position to find out.
-
- If someone looks this up, it is a documented bug. However, I don't
- have the AMD CPU manuals to look it up.
-
- The reason this is only for the 386-40 is because it is basically a
- superscaler CPU (like a 486-2DX50) consisting of something like
- 2-25 MHz chips. I'm not really into the hardware aspect of personal
- computers, so don't ask me much more than this. But is basically
- timing between the two where the bug occurs.
-
- As the guy with the flat-hat says, "A PC that is MS-DOS compatible
- might not be UNIX compatible, but any that is compatible with UNIX
- will run probably anything."
-
- --- Eric Knight
-
-