lad@eplrx7.UUCP (Lawrence Dziegielewski) (08/21/87)
I have recently acquired an XC68851RC16 PMMU for my Mac II. I have not
received my AU/X yet, so I have put off installing it. My question: will
installing the PMMU have any effect on the performance of the II under the
Finder, or maybe the MulitFinder? My memory configuration is 5 MB.
Also, where does the PMMU install on the motherboard. Thanks in advance
for the help.
--
Lawrence A. Dziegielewski | E.I. Dupont Co.
...{dgis!psuvax1}!eplrx7!lad | Engineering Physics Lab
Cash-We-Serve 76127,104 | Wilmington, Delaware 19891
MABELL: (302) 695-1311 | Mail Stop: E357-318jww@sdcsvax.UCSD.EDU (Joel West) (08/21/87)
Go to Radio Shack and buy their chip puller (it looks like a pair of ice tongs or large tweezers). Near the front of the motherboard is a chip labeled (C) Apple '86, one of the big square chips. The others are labelled Motorola and are recognizable. Pull the Apple HMMU out and place the 68851 in the same orientation. The Mac OS runs just fine. I haven't done any speed benchmarks to establish whether it's any slower, but it's certainly not noticeable.
fnf@mcdsun.UUCP (Fred Fish) (08/21/87)
In article <460@eplrx7.UUCP> lad@eplrx7.UUCP (Lawrence Dziegielewski) writes: >I have recently acquired an XC68851RC16 PMMU for my Mac II. I have not Where did you acquire this little jewel from!! After I got my Mac II about two months ago, I spent several days attempting to locate a commercial source of the PMMU chips. What I was able to determine, from talking with our purchasing people here and typical vendors like Hamilton-Avnet, was that the Oakhill "silicon factory" was only supplying parts under special, negotiated price (and large quantity) conditions to OEMs. None of the usual resellers that I talked to had any in stock, had ever HAD any in stock, or expected to get any soon. I was finally able to locate a source out in Sacramento CA that had a few sample parts for over $600 each, but since I don't have an immediate need for one yet either, I decided to take a wait and see attitude. -Fred (Works for Motorola and can't even get a PMMU) Fish -- = Drug tests; just say *NO*! = Fred Fish Motorola Computer Division, 3013 S 52nd St, Tempe, Az 85282 USA = seismo!noao!mcdsun!fnf (602) 438-3614