home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!gatech!destroyer!ncar!noao!arizona!arizona.edu!jupiter!paul
- From: paul@jupiter.ame.arizona.edu (Paul Harris)
- Newsgroups: comp.sys.atari.st
- Subject: Re: More Falcon news...
- Message-ID: <1992Nov20.122035.4010@arizona.edu>
- Date: 20 Nov 92 19:20:34 GMT
- References: <1992Nov19.213205.86@uoft02.utoledo.edu>
- Reply-To: paul@jupiter.ame.arizona.edu
- Distribution: world,local
- Organization: University of Arizona
- Lines: 33
- Nntp-Posting-Host: jupiter.ame.arizona.edu
-
- In article 86@uoft02.utoledo.edu, jsteiner@anwsun.phya.utoledo.edu (jason 'Think!' steiner) writes:
- > undermind!Steve_Johnson@overmind.mind.org writes:
- > > The Falcon030's 68030 has a 24-bit address/16-bit data bus. It
- > > get's a little confusing, though, because the COMBEL (the system
- > > controller) has a 32-bit bus to RAM and to the VIDEL (the video
- > > controller). The machine on the whole, though, isn't a 'TRUE' 32-
- > > bit machine (kinda like the Mac LC II/Performa 400). The PDS
- > > (processor-direct slot) is also 24-bit address/16-bit data. There
- > > is some hope, though, that a third party will be able to 'fix' this
- > > (there will, most definitely, be a 32-bit FAST RAM expansion for
- > > the Falcon030 that will allow more RAM, at least, from what I've
- > > heard).
- >
- > this is -really- strange. i was under the impression that all 68k
- > processors after the '020 were 32 bit all the way 'round. can someone
- > post a 'family tree' of the 68k series & what is what? going to
- > 24/16 for a 32 bit processor sounds like something Intel would do,
- > not Motorola.
- >
- > i realize that Motorola doesn't have a lot to do with the bus design,
- > but it seems to me that trying to fit a 32 bit external processor
- > on a 24/16 bus would be a lot more hairy than just making it 32 bits
- > in the first place.
- >
- > jason
- >
- Why is this so strang? In a TT, the 68030 is running at 32 MHz, and
- TT-RAM is 32-bit, 32 MHz. But everything else--ST-RAM, DMA, vidio--
- is all at 16-bit, 16 MHz. And I get about 4x the speed with only ST-
- RAM, running the same program (no 68030 or 68882 commands).
-
- -Paul Harris @ @
- paul@jupiter.ame.arizona.edu \___/
-