[Duo2400] Re: Replacement PB Duo 270C active matrix screen?

[Larry Friedman]

Something else I remember was that the 520-540c had the 68LC040 chip 
while the Japanese-market 550c had the full blown 68040 chip (very 
fancy). One thing I noticed was that the 210-270c had the full '030 
chip while the 280 + 280c had the 68LC040.

~ Larry


On Tuesday, January 21, 2003, at 09:22  PM, Larry Friedman wrote:

> http://www.everymac.com/systems/by_processor/68lc040.html
> http://www.tspintl.com/support/tsp/quadra.htm
> http://burks.brighton.ac.uk/burks/foldoc/92/75.htm
> http://www.pix.net/languard/mc68040.shtml
> http://www.crashtips.com/macacronyms.html
>
> And that's just the surface. The 68LC040 did not have an FPU.
>
> Larry
>
>
> On Tuesday, January 21, 2003, at 09:05  PM, Marc Sira wrote:
>
>>>> Are you sure of the 280c being faster than the 270c?  I had
>>>> supposed that the FPU in the 270c might more than make up for the 
>>>> 030-040
>>>> difference.
>>>
>>> The 270c doesn't have a built in FPU. However you can take advantage 
>>> of an
>>> FPU if you run the 270c in a DuoDock (FPU was optional in the 
>>> original Dock
>>> and standard in the DuoDock II & DuoDock Plus).
>>>
>>> The 270c uses a 68LC030 and the 280c uses a 68LC040. The LC
>>> nomenclature is referring to a lack of FPU.
>>
>> I'm not sure where you got that idea, but Paul is correct, and the 
>> 270c has
>> a built-in FPU (I used to run Infini-D on mine). It also has a 68030, 
>> not a
>> "68LC030" - I'm not certain that model even exists , but if it does it
>> refers to something other than the lack of an on-chip FPU, since the 
>> FPU is
>> external to the 68030 in any case.
>>
>> In terms of actually answering the question, a 68[LC]040 is 
>> theoretically twice
>> as fast as a 68030 at integer ops. My experience is that the 
>> real-world
>> difference on a Mac is somewhat less than that, though this may 
>> partly reflect
>> the tendency to run a later OS version on a 68040. Between a Duo 280 
>> and 270
>> you'll find that the 280 is somewhat appreciably faster most of the 
>> time and
>> considerably faster for integer-only number crunching, but vastly 
>> slower (or
>> simply impossible to use) for floating-point work. Since you're only 
>> likely to
>> actually need an FPU for things like non-realtime graphics rendering, 
>> you can
>> decide which would suit your needs better. Most Mac software never 
>> hits the
>> FPU, especially 68k stuff (since the presence of one is so 
>> hit-and-miss, and
>> failing to find it is usually a crashing matter on a stock OS).
>>
>> -- 
>> Marc Sira		|	toh at victoria.tc.ca
>> If you can't play with words, what good are they?
>>
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>
>  RoadTools $30 PodiumPad available at Apple retail stores, $20 
> Traveler  CoolPad at Staples. Both in white for iBooks at 
> <http://roadtools.com>
>
> Midwest Mac Parts  ][  <http://www.midwestmac.com>  After-market parts 
>  for Macs.   ][  888-356-1104 ][
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> MacResQ Specials: LaCie SCSI CDR From $99! PowerBook 3400/200 Only 
> $879! Norton AntiVirus 6 Only $19! We Stock PARTS! 
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