Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!pasteur!ucbvax!decwrl!pyramid!cbmvax!heimat!sneakers
From: sneakers@heimat.UUCP (Dan "Sneakers" Schein)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Is 14.32MHz too fast for my expansion RAM?
Message-ID: <2236.AA2236@heimat>
Date: 26 Aug 88 11:47:17 GMT
Followup-To: comp.sys.amiga.tech
Organization: Sneakers Computing
Lines: 49

[ Tommorow is international line eater day. Don't forget to feed yours! ]

In Message <4572@cbmvax.UUCP>, daveh@cbmvax.UUCP (Dave Haynie) writes:

>in article <3127@sdsu.UUCP>, larryr@sdsu.UUCP (Larry Riedel) says:
>> I am thinking about getting that 14MHz 68000 thing from CMI, but I am
>> wondering if the extra clock speed will be wasted.  I have one of those
>> Micron 2MB boards, and I don't know how fast the memory is.  Will the
>> fast processor just be hurry-up-and-waiting?
>
>All of the Amiga speedup boards run the Expansion Bus memory at it's
>normal speed.  They do speed the system up, but they only run faster
>in the following cases:
>
>	- Internal CPU operation
>	- Cache hit
>	- Access to special fast memory
>
>If you're using a Commodore-Amiga A2620 or a CSA or Hurricane board with
>their fast memory options, you get all three benefits.  A plain fast
>68000 with no on-board memory designed specifically for it will only
>get the first benefit.  So you'll get some additional speed, but it's
>had to say just how much.  With a decent amount of memory that'll keep
>up with that 68000 (it would go somewhere on the 68000's board), you
>might approach a factor of 2 speedup (you'll never really get there,
>since you have to access CHIP ram or I/O registers at least some of
>the time).
>
   Hmmmm this sounds like you should be able to obtain very similar results by
   just upgrading to a MC68010. After all most internal commands of the 010
   are roughly 1 to 2 times faster than a 68000 and apperars to be the only
   benefit of this product. Hazey any comments?

   Heres a thought - how about using one of these speed boards(?) with a 68010
   in place of the 68000. Hmmmm..... now where did I put that 010  :-)

>> Larry         ...!ucsd!sdsu!larryr
>Dave Haynie  "The 32 Bit Guy"     Commodore-Amiga  "The Crew That Never Rests"


--
 Dan "Sneakers" Schein     {alegra|amiga|rutgers|uunet}!cbmvax!heimat!sneakers
 Sneakers Computing
 2455 McKinley Ave
 West Lawn PA 19609                          Call:      BERKS AMIGA BBS
                                                    24 Hrs - 3/12/2400 Baud
 Disclaimer: Any opinions expressed are	            40 Meg -=- 215/678-7691
             those of Sneakers Computing

 Of course heimat is an Amiga, doesn't everyone run UUCP & UseNet on an Amiga?