Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!sdd.hp.com!hp-pcd!hpsgwp!plim From: plim@hpsgwp.sgp.hp.com (Peter Lim) Newsgroups: comp.sys.ibm.pc.hardware Subject: 80486 expert opinion wanted ... Message-ID: <3370002@hpsgwp.sgp.hp.com> Date: 28 Dec 90 06:14:25 GMT Organization: HP Singapore IC Design Ctr Lines: 29 Hi Netlanders, I have an urgent question. How do I ensure that a 486 CPU is not a dud ? I have heard before that revision B5 and earlier of the 486 chip has a defect which causes the chip to fail under UNIX or similar protected mode OS. I have also heard that revision B6 and onward is fine. Then, what changes are there from B6 to C0 or C1 revisions ? I am currently evaluating a 486 board with OPTI cache controller. The manual claim that the 486 is revision B6 (but it is not printed on the CPU itself). How can I find out if the chip is really B6 revision one ? What test program can I run to find that out ? I have to make the decision in 2 days' time, that's the reason for the 'urgent' above :-). Any word of wisdom is welcome. E-mail me directly or post to this group. Thanks in advance. Regards, . .. ... .- -> -->## Life is fast enough as it is ........ Peter Lim. ## .... DON'T PUSH IT !! >>>-------, ########################################### : E-mail: plim@hpsgwg.HP.COM Snail-mail: Hewlett Packard Singapore, : Tel: (065)-279-2289 (ICDS, ICS) | Telnet: 520-2289 1150 Depot Road, __\@/__ Singapore 0410. SPLAT ! #include