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- Path: sparky!uunet!mcsun!sunic!aun.uninett.no!nuug!fredrik.atari.no!jornmoe
- From: jornmoe@fredrik.atari.no (Joern Moe)
- Newsgroups: comp.sys.atari.st
- Message-ID: <H.6a78NGVZTA2@fredrik.atari.no>
- Organization: None
- Subject: A1200 versus Falcon 030 once again (FAQ?)
- References: <1993Jan19.195619.5411@newshost.lanl.gov>
- <1993Jan20.194026.25748@westminster.ac.uk>
- Reply-To: jornmoe@fredrik.atari.no
- X-Software: HERMES GUS 1.03 Rev. Apr 14 1992
- Date: Thu, 21 Jan 1993 22:48:46 MET
- Lines: 28
-
- In <1993Jan20.194026.25748@westminster.ac.uk>, William Hargreaves writes:
- >Why have Atari made the Falcon a 32-bit machine with only a 16-bit data bus.
- >Surely, this will mean it only runs half as fast as it should.
-
- It may seem like it only would run at half of what it could, but the
- 68030 is designed to perform at 100% when in async mode. That is 3 clock
- cycles for each longword access on a 32 bit bus. However, when in sync
- mode it uses 2clock cycles for each longword access on a 32 bit bus.
- This means that the bus has owercapacity (i.e. the bus will be idle
- every third (on an average) clock cycle. In the falcon they use sync
- mode on a 16 bit bus. This gives a 4 clock cycle for each longword
- access to the bus. This implies a 25% reduction in performance, not 50%.
-
- These days the atari and amiga people are arguing which computer have
- the fastest cpu (Falcon 030 versus A1200). The 68030 have better performance
- than a 68020 when placed in an equal arcitecture. Additionaly the A1200 runs
- at 14.4 Mhz, wheras the F030 runs at 16Mhz (i realy think its 16.01xxxMhz)
- giving it a extra 10% over the A1200. Summing it all up, my bet is that
- this is a dead race!
-
-
- Is this the fifth or fifteenth time I wrote this story?
- May someone (spellcheck it and) add this too the FAQ???
- --
- _______________________________________________________
- / Joern F. Moe / All above is my own personal opinion! \
- / Oslo, Norway / Any lack of opinion above is also mine! \
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