Path: utzoo!attcan!uunet!cbmvax!daveh From: daveh@cbmvax.commodore.com (Dave Haynie) Newsgroups: comp.sys.amiga Subject: Re: A2000, B2000, what's the DEAL!??? Keywords: Revisions, A2000, B2000...etc etc... Message-ID: <15811@cbmvax.commodore.com> Date: 12 Nov 90 20:05:30 GMT References: <15706@brahms.udel.edu> Reply-To: daveh@cbmvax.commodore.com (Dave Haynie) Organization: Commodore, West Chester, PA Lines: 62 In article <15706@brahms.udel.edu> jeremym@brahms.udel.edu (Jeremy A Moskowitz) writes: >Alirght, alright... people have been talking >about the two types of Amiga 2000 machines.... >There's the A2000 and the B2000. As far as I know... >The only difference is that teh B2000 was made in California >and the A2000 was the German model which was most accepted.. It's a little more meaningful, if you're interested in accuracy, to say A2000a and A2000b. The former was designed in Germany, based on the A1000 motherboard design, and the latter was designed in the USA (West Chester, PA, not California) based on the A500 motherboard design. They are actually both called "A2000"; "A2000" vs. "B2000" was an internal designation within engineering. >2) What incompatabilities are there between the machines? The main difference is that the A2000b adds an extended Video Slot, Monochrome video output, and an extended Coprocessor Slot. An A2000a (which, by the way, never shipped in the USA) can't use a flickerFixer, and for use with a Coprocessor Slot board like the A2630, the 68000 must be removed. >3) What do the jumpers on the B2000 vs. the A2000 do? The A2000b jumpers are basically a superset of the A2000a jumpers. There are three added to support the ECS Agnus changes, one for choice of LINE vs. VSYNC as the 60HZ Tick signal, one to choose between A1000 and A500 standard for the light pen mouse port, and one to remove an extra wait state added for DMA to Chip memory from the expansion bus (this was necessary because the Fat Agnus and Gary combination didn't quite meed the published specs. for DMA into Chip RAM). >4) Why do I like howard stern so much Because getting up before 10:30 or so is hell, and you haven't discovered drugs or liquor yet.... >6) Will the fatter agnus work in the B2000? There is no fatter agnus. However, the 1 Meg ECS Agnus, 8732A, will work in the A2000b. >7) Would somone be willing to list all the revisions >of the A2000 vs. B2000 up to 4.2? or beyond? No >9) What's the deal with the B2000's keyboards SUCKING >the first character on a cold/warm boot? Apparantly, >there's a fix of a resistor cut in the keyboard housing... >but, I'm not going in there until somone tells me how to do it... In the production runs of earlier A2000bs, the keyboard was changed. The newer keyboard was adversely affected by some capacitors put on the keyboard lines to quiet down the older and noisier keyboard that had been used. If you have C911 and C912 removed from near the keyboard connector, everything should be hunky dorey. > *UNIX* // Pri: jeremy@freezer.it.udel.edu Second: jeremym@brahms.udel.edu -- Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests" {uunet|pyramid|rutgers}!cbmvax!daveh PLINK: hazy BIX: hazy Standing on the shoulders of giants leaves me cold -REM