Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!dali.cs.montana.edu!milton!uw-beaver!rice!uupsi!rodan.acs.syr.edu!amichiel
From: amichiel@rodan.acs.syr.edu (Allen J Michielsen)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Comparing the Mac+ and SE
Message-ID: <1991Apr26.153645.5151@rodan.acs.syr.edu>
Date: 26 Apr 91 15:36:45 GMT
References: <764@newave.UUCP> <1068@eplunix.UUCP>
Organization: Syracuse University, Syracuse, NY
Lines: 33

In article <1068@eplunix.UUCP> das@eplunix.UUCP (David Steffens) writes:
>In article <764@newave.UUCP>, john@newave.UUCP (John A. Weeks III) says:
>> But for all practical difference, there is no real speed difference between
>> the Mac + and the SE.  At least not a difference worth nit picking about.
>
>Wrong.  The SE has more of QuickDraw in ROM.  Code in ROM executes
>twice as fast as code in RAM... a speed difference the SE over the Plus
>by about 30-50% depending on the exact mix.  This will also be noticeable
>to the user when running programs which do a lot of QuickDraw operations.

Wrong.  Code in ROM executes SLOWER because of the slow access times of the
roms themselves.  If this weren't the case, you wouldn't see a drastic system
improvement when you copy rom to ram (and you do, period).  However, you were
close, ROM Quickdraw is faster than system / RAM Quickdraw because of system
overhead  (Part of which IS the interaction between ram access and video 
refresh).  I'm also not conviced that all Quickdraw ROM routines are loaded 
into ram by the system, they either are probably loaded as required or when
required, or generated as needed.  ANyway, you are right when you see a pickup
in quickdraw routines on the se, but not for the reason stated (or improperly
stated).  However, generally the original poster was fairly accurate, if you
look at a typical user using a typical mix of applications in typical fashion
in a typical environment.  The difference is pretty small overall.  IF however,
the user mix were using QuickDraw intensive applications, the difference would
be noticeable.

al



-- 
Al. Michielsen, Mechanical & Aerospace Engineering, Syracuse University
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