Path: utzoo!attcan!uunet!cbmvax!daveh From: daveh@cbmvax.UUCP (Dave Haynie) Newsgroups: comp.sys.amiga Subject: Re: 68020 Message-ID: <5795@cbmvax.UUCP> Date: 26 Jan 89 00:35:23 GMT References: <11061@gryphon.COM> Organization: Commodore Technology, West Chester, PA Lines: 41 in article <11061@gryphon.COM>, tsub@pnet02.cts.com (Tom Wang) says: > > How does the Commodore A2620 (68020, M68881, and 68851 MMU) compare with the > Ronin Hurricane Board? It seems to me that they are both basicly the same > thing, except the Ronin is upgradable to 68030 and M68882 (am I correct?). Any properly designed 68881 interface will support the 68882, since they're 100% pin compatible. The A2620 comes with 2 megs of 32 bit DRAM, upgradable to a total of 4 megs. The A2620 memory supports DMA from expansion devices, which may result in hard disk performance 150%-200% that of a plain 68000 Amiga. Non-DMA performance will be increased somewhat too. The A2620 memory runs in 2 wait states (the extra one being because of the 68851 MMU). The Ronin lets you add on a board that'll support up to 4 megs. The Ronin memory add on is completely non-standard, and requires a special configuration program to add it in. With fast filesystem, a DMA driven hard disk, and the suggested Ronin configuration, your hard disk performance will be 50%-75% that of a plain 68000 Amiga. A non-DMA driven hard disk interface will go faster than on a plain 68000 with Ronin. The Ronin memory board runs in 1 wait state. Ronin also sells a 68020 to 68030 converter, which allows the use of a 68030 in a 68020 socket. I would expect it to work in just about any 68020 board, including the A2620, CSA, and LUCAS boards as well as the Ronin, though naturally it's mechanically designed to fit with the Ronin board. Such an adaptor does not let you use any of the faster features of the 68030, so, like the Mac IIx and most other 68030-dropped-into-a 68020 systems, you may see something around 15% increase in system speed with the 68030 adaptor. The main advantage of adding a 68030 adaptor to a Ronin board will be the 68030's MMU (already present on the A2620). > Tom C. Wang > UUCP: {ames!elroy, }!gryphon!pnet02!tsub > INET: tsub@pnet02.cts.com -- Dave Haynie "The 32 Bit Guy" Commodore-Amiga "The Crew That Never Rests" {uunet|pyramid|rutgers}!cbmvax!daveh PLINK: D-DAVE H BIX: hazy Amiga -- It's not just a job, it's an obsession