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- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: MMR speed questions
- Message-ID: <1992Aug13.025306.1001@msus1.msus.edu>
- From: lkoop@TIGGER.STCLOUD.MSUS.EDU (LaMonte Koop)
- Date: 13 Aug 92 02:53:05 -0600
- Reply-To: lkoop@TIGGER.STCLOUD.MSUS.EDU
- References: <al158305.713633200@academ01>
- Organization: St. Cloud State University, St. Cloud, MN
- Nntp-Posting-Host: tigger.stcloud.msus.edu
- Lines: 38
-
- In article <al158305.713633200@academ01>, al158305@academ01.mty.itesm.mx (Gustavo Cordova Avila) writes:
- >
- > Hiya pplz :) I just installed an MMR into my A1000. I was thinking on
- >leaving the original internal drive inside, but the little extension tower
- >I made for the cpu socket kept failing, it seems that every time it got
- >a little warm it would drop a connection or something like that, so I
- >had to leave the internal drive dangling outside :( Maybe I'll redirect
- >df0 to df1 and get myself another external drive. Will the Sybil thing work
- >ok in that configuration?
-
- I don't know about Sybil offhand, but the problems with your 'tower'
- modification to the CPU socket sounds like you have a cold solder joint in
- there (or if no solder was used, thermal expansion is causing a connection
- to spread apart). This can usually be remedied fairly easily.
-
- > Well.. Going to the question in question :) What's the max speed cpu that
- >one can install in an MMR? and WHY? I've seen ads for the VXL device saying
- >it works up to 40, and people discussing running it up to 60 Mhz (ouch), and
- >the most I've heard of the MMR is 38Mhz for the cpu and 50 for the fpu,
- >so how come??
-
- The MMR is rated for up to 40 MHz operation in terms of the CPU input clock.
- Overclocking of ANY device such as this, VXL or MMR, is not something I would
- recommend. You have to remember, in an accelerator such as this, you have
- basically installed a seperate system on top of your existing Amiga. This
- new system communicates with the Amiga by means of the CPU socket, but when
- left to its own it is a different machine. The CPU input clock on the
- accelerator is also used as the input clock to the other support devices
- on the board (such as byte-select/cache inhibit control/bus interface logic,
- etc..) which have input clock maximum specifications. Thus, your CPU may be
- rated to handle a higher clock rate, but the other devices on the accelerator
- may not be.
-
- ----------------------------------------
- LaMonte Koop -- SCSU Electrical/Computer Engineering
- Internet: lkoop@tigger.stcloud.msus.edu -OR- f00012@kanga.stcloud.msus.edu
- "You mean you want MORE lights on this thing???"
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-