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Path: sserve!manuel.anu.edu.au!munnari.oz.au!news.hawaii.edu!ames!elroy.jpl.nasa.gov!usc!zaphod.mps.ohio-state.edu!darwin.sura.net!jvnc.net!gmd.de!Germany.EU.net!lemis!grog From: grog@lemis.uucp (Greg Lehey) Newsgroups: comp.unix.bsd Subject: Re: does the UMC chipset work with 386BSD? Message-ID: <2399@adagio.lemis.uucp> Date: 12 Nov 92 17:39:37 GMT References: <49432@shamash.cdc.com> Organization: LEMIS, W-6324 Feldatal, Germany Lines: 28 In article <49432@shamash.cdc.com> pbd@runyon.cim.cdc.com (Paul Dokas x4629) writes: >I'm looking at a 486DX-33 (2 VESA LB slots, 6 ISA slots, 256K >cache, 8 MB DRAM) that uses the UMC chipset with an Intel 486. >Has anyone heard of the UMC chipset? And does anyone know if >I'm going to have problems running 386BSD? Well, I have just removed a 486/50 with UMC from my machine, and gone back to a 486/33 using an OPTI chip set. Nothing else changed - I had a different 486/33 OPTI board (same design, though) in there before. I'm running BSD/386. The OPTI board ran with no problems since March, and I installed the UMC board last week. On average, it crashed 5 times a day. This could be a defective board, of course, but I didn't have another board to compare it with. In the meantime, a report came out in c't, a German magazine, comparing chipsets. It showed that the UMC board is very conservative in its bus cycle, and the results with some benchmarks showed down to 40% of the performance of other chipsets (i.e. the program ran 2.5 times as long on a machine with the other chipset). This ties in with the fact that my initialisation routines showed a speed only about 10% faster than the 33 MHz OPTI chipset. -- Greg Lehey | Tel: +49-6637-1488 LEMIS | Fax: +49-6637-1489 Schellnhausen 2, W-6324 Feldatal, Germany