Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!midway!clout!chinet!miroc!reaper!mmm From: mmm@reaper.Chi.IL.US (Michael Marvin Morrison) Newsgroups: comp.sys.amiga.hardware Subject: Re: 14 Mhz Hack Message-ID: Date: 16 May 91 12:36:54 GMT References: <1991May10.104421.22314@rulway.LeidenUniv.nl> , <1991May15.005045.3401@news.iastate.edu> <1991May15.103225.30756@kuhub.cc.ukans.edu> Lines: 41 In article <1991May15.103225.30756@kuhub.cc.ukans.edu> markv@kuhub.cc.ukans.edu writes: >>>I would also suggest using a 16mhz 68010. >> I was told by a man at Motorola in the MC680x0 conference that a 16 MHz 68010 >> does not exist.Since his post came from Motorola I'm assuming he is correct. > >Yes, the fastest 68010 available is a 12MHz part. However, the >difference between 12 and 14.32 Mhz is about 15% which is right on the >margin of the "safety zone" built into most tolerances. I have used a >12 MHz part at 14 successfully, as have some others. The succes ratio >is about 50/50 per chip. The LC parts (ceramic case) seem to do a bit >better, probably because the ceramic case has some better heat >dissipation. If you can keep the chip cool, like a good size direct >heat sink, your probably okay since heat is what causes the most >problems (witness the "IceCube" hack for a 50MHz 386). > >Warning, I make no claim as to the safety of trying this, however its >very unlikely to hurt the machine, just fry an innocent CPU or two. > >Also, if your doing some heavy interrupt use (ie: fast interrupt drive >I/O for one), you can benefit greatly from the 010 if you move the >Exception table into fast. >-- >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >Mark Gooderum Only... \ Good Cheer !!! I made a mistake.. the electrical specs I was looking at were for an '000. Checking the '010 electrical specs says only a 12.5mhz chip max. While you should generally not overdrive a processor, it *should* work (I run my 25mhz XC '030 at 28mhz with no problems, but this chip was designed much later). I can't remember thier number, but Krueger Electronics sells most 680x0 series chips for next to nothing (ie: 8mhz 010 for $10). With a 30 day Money back guarantee to work. You should give them a call and see if they have any 12.5Mhz versions. Buy a couple. The heat-sink would be a good idea. Unless you go nuts, you probably won't burn the part, it will just quit working or act flakey at a higher clock speed that what it was designed for, and you can usually observe this in enough time to shut down. -- Michael M Morrison /| |\ mmm@reaper.chi.il.us | | Cash, for Cache.. | | reaper!mmm@miroc.chi.il.us \| Hmm.. sounds fair. |/