Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!seismo!ut-sally!utah-cs!utah-gr!stride!l5comp!scotty From: scotty@l5comp.UUCP (Scott Turner) Newsgroups: comp.sys.amiga Subject: Re: 14.31818 MHz 68010 Upgrade Message-ID: <326@l5comp.UUCP> Date: Mon, 17-Aug-87 04:49:29 EDT Article-I.D.: l5comp.326 Posted: Mon Aug 17 04:49:29 1987 Date-Received: Tue, 18-Aug-87 02:28:28 EDT References: <19965@ucbvax.BERKELEY.EDU> <2184@cbmvax.UUCP> <20005@ucbvax.BERKELEY.EDU> <2201@cbmvax.UUCP> Reply-To: scotty@l5comp.UUCP (Scott Turner) Distribution: na Organization: L5 Computing, Edmonds, WA Lines: 46 Summary: The 680x0 is an interesting chip. :) In article <2201@cbmvax.UUCP> grr@cbmvax.UUCP (George Robbins) writes: >Uh, minor technical issue: where are you going to get these 16 MHz 68010 >parts from? The Motorola folks were by today an I asked them what the >status of fast 16 bit parts was at the present. They indicated that 12 MHz >was the top speed for both the 68000 and 68010, although there was some chance Yeah Motorola retreated from the high ground with the 68000 back in late '83. Until then they had plans of making a MC68000L16, they even made a few samples that went to places like Tektronix. But a 16MHz 68000 would be a tough chip to keep up with and yields etc... But leave it to the Europeans (How come they get all this neat stuff first?) to go where Motorola wouldn't. I think it's Phillips (but could be some other company) that has a CMOS 16MHz capable 68000. Also as one further note, just TRY and get a MC68010L12. Most 68010's are used in virtual memory systems which with the speed delays from the MMU are nearly ALWAYS limited to 10Mhz. If you walk in off the street and try to get a L12 you'll more than likely be out of luck, order 100 to 250 of them and you may only have to wait 6 to 10 weeks. In any case, a MC68000L12 is about $16 bux, a MC68010L12 is $158. For even more fun take a look at the price of a MC68020RC12 ~$100. I haven't figured out why a 68010 should cost more than a 68020 but the real point here is that unless you're going for a high speed 68000 design you may find it cheaper to use a 68020 rather than a 68010. >Now of course there's a pretty good chance you can get some some of the >12 MHz parts to clock at 14 MHz with reasonable reliability, but the timing >margins won't be the best. The 68000 is an amazing chip. :-) One of the cute things about it is that alot of it's timing values are based on the shape of the clock. You can "tweak" a 68000 chip into operating at higher speeds by carefully adjusting the shape of the clock signal feeding the chip. I've been selecting MC68010L10's in order to get parts that can run at 12Mhz. This can lead to weird happenings though. There was one system I had running on one of these selected parts that ran fine so long as the office coffee pot was turned off. But about an hour after they'd turn it on the computer would start crashing. Leave the coffee pot off for three days, no crashes. Turn it back on, crashes within the hour. (BTW 68010L10's are ~$50 which can be a strong motive for digging through them to find 12Mhz capable parts ;) Scott Turner -- UUCP-stick: stride!l5comp!scotty | If you want to injure my goldfish just make UUCP-auto: scotty@l5comp.UUCP | sure I don't run up a vet bill. GEnie: JST | "The bombs drop in 5 minutes" R. Reagan "Pirated software? Just say *NO*!" S. Turner