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- Newsgroups: comp.sys.atari.st
- Path: sparky!uunet!mcsun!sunic!kitten.umdc.umu.se!fizban.solace.hsh.se!hasse
- From: hasse@solace.hsh.se (Hans Holmberg)
- Subject: Re: More Falcon news...
- Message-ID: <1992Nov21.033154.2194@solace.hsh.se>
- Organization: Solace Computer Club, Sundsvall, Sweden
- References: <1992Nov19.213205.86@uoft02.utoledo.edu> <1992Nov20.122035.4010@arizona.edu>
- Distribution: world,local
- Date: Sat, 21 Nov 1992 03:31:54 MET
- Lines: 46
-
- In <1992Nov20.122035.4010@arizona.edu> paul@jupiter.ame.arizona.edu (Paul Harris) writes:
-
- >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).
-
- That is totally wrong! The videomemory on a TT is 64 bits wide according
- to the docs I read. It multiplex that data to 32 bits for the 68030.
- Allthough the videobus only uses 16MHz as you said.
-
- >-Paul Harris @ @
- >paul@jupiter.ame.arizona.edu \___/
-
- Hasse
- --
- / email: hasse@solace.hsh.se, irc: Knightman, flames: /dev/null \
- \ snail-mail: Hans Holmberg, Sommarvagen 5, 854 67 Sundsvall, Sweden /
- / phone: +46 60 569169, fax: +46 60 569266 \
- \ "In a crazy world a sane person would appear to be crazy." /
-