Path: utzoo!attcan!uunet!aplcen!uakari.primate.wisc.edu!sdd.hp.com!cs.utexas.edu!rutgers!cbmvax!daveh From: daveh@cbmvax.commodore.com (Dave Haynie) Newsgroups: comp.sys.atari.st Subject: Re: TT (Who has one?) Keywords: long Message-ID: <13477@cbmvax.commodore.com> Date: 27 Jul 90 14:26:36 GMT References: <1990Jul20.141733.5567@cunixf.cc.columbia.edu> <1990Jul20.233102.24577@math.lsa.umich.edu> <13415@cbmvax.commodore.com> <11060@chaph.usc.edu> Reply-To: daveh@cbmvax (Dave Haynie) Organization: Commodore, West Chester, PA Lines: 32 In article <11060@chaph.usc.edu> baffoni@aludra.usc.edu (Juxtaposer) writes: >In article <13415@cbmvax.commodore.com> daveh@cbmvax (Dave Haynie) writes: >>By the way, the 16MHz A3000s are also using the 16MHz 68881 at present, and it >>is surface mounted. I don't know which FPU is in the 15.8MHz Mac IIcx, but > ^^^^^^^^^^^^^^^^^^ >The rep at the demo said that the A3000s came with a coprocessor slot that >when a 68040 is dropped in, the '40 takes over and uses the '30 as a slave >processor. I am not sure that this is the same slot as would hold a 68881 >(I am not up on the # of pins, etc.) but with the '40 in the machine, who >cares if it has a 68881 or '82 when it has a '30 doing the job? The 68030 and 68882 are vastly different animals, regardless of whether or not you have a 68040 board in or not. The A3000's Coprocessor Slot is a 200 pin connector which will support cache, '040, or even a faster '882 if someone really wants to build such a critter. Add-on CPUs have the option of taking over from the 68030 or leaving it active, but no one's going to use the '030 as a math processor. Especially the '040, which has on-chip math between 5 and 10x the speed of '882 math. The reason Commodore and Apple surface mount these things has little to do with saving the cost of a $1.00 socket. Things get much quieter when they're surface mounted. And the cost of a part in a surface mount package can be as little as 1/2 that of the PGA part. Think of it as getting an '882 for the price of an '881, or something along those lines. >-Mike Baffoni -- Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests" {uunet|pyramid|rutgers}!cbmvax!daveh PLINK: hazy BIX: hazy The Dave Haynie branch of the New Zealand Fan Club