Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!modcomp!kevin From: kevin@modcomp.uucp (Kevin Smith) Newsgroups: comp.sys.amiga.hardware Subject: Re: Crippled A3000 Message-ID: Date: 6 Jun 91 12:25:03 GMT References: <22123@cbmvax.commodore.com> <193f5e0a.ARN1469@pilhuhn.ka.sub.org> <22175@cbmvax.commodore.com> Sender: news@modcomp.uucp (Mr. News) Organization: MODCOMP, an AEG company Lines: 28 daveh@cbmvax.commodore.com (Dave Haynie) writes: >In article <193f5e0a.ARN1469@pilhuhn.ka.sub.org> hwr@pilhuhn.ka.sub.org (Heiko W.Rupp) writes: >>In article <22123@cbmvax.commodore.com>, Dave Haynie writes: >>> So yes, it's possible for a 25MHz add-in to run the entire system at >>> 25MHz. With such an add-in installed, there is no difference between an A3000 >>> that came at 25MHz and the upgraded 16MHz system. >>Would a 50 Mhz 68030/882 Card (or even a 040 Card with a higher speed than >>25 Mhz) in the coprocessor slot also run or would it need more bus bandwith than >>available on the A3000 bus ? >Just like with the A2000, an A3000 coprocessor device can run with any clock. >However, you can only slave the A3000 itself to either 16MHz or 25MHz. So if >you plug in a 50MHz 68030 board, you don't run the A3000 at 50MHz. The 3000's >memory is less than optimal to a 50MHz processor. Most likely, any such fast >'030 board would have lots of external cache. So let me get this straight, if I was to find a really good deal on a 3000 16MHz system and I want to run at 25MHz all I need to do is find an add on card running at 25 Mhz, plug it in, it disables the motherboard CPU and my system runs exactly like a 25MHz 3000 with no possible performance degradations because I'm still using the 16MHz motherboard with the 25MHz CPU in the coprocessor slot. Kevin Smith modcomp!glsdev!kevin card