mwnorman@bnr.ca (Michael Norman) (05/04/91)
Here is a question I have about the LC: I have seen adds for FPU-cards and Ethernet cards (and IIe cards, but who cares :-) to go into a LC. Now, if I recall my Motorola manuals correctly, your basic memory-manager-unit chip works with 68020's, n'est-ce pas? So, how come I don't see adds for such beasties? A LC with MMU would seem to be a nice machine for the $$ - System 7.0<some_version_number> could use the MMU to do VM. Any ideas, Thanks in advance, -- Mike Norman,c/o Bell-Northern Research UUCP:...uunet!bnrgate!bcarh332!mwnorman P.O. Box 3511 Station 'C' Ottawa BITNET: MWNORMAN@BNR.CA Ontario Canada K1Y 4H7 M/S 101 Internal E-mail: mwnorman@bcarh332 OR tel: (613) 763-7717 (FAX:613-763-7742) Michael.Norman.9S82@bnr "Don't have a cow, man!" B. Simpson
bbesler@vela.acs.oakland.edu (Brent H. Besler) (05/04/91)
I believe that Dynamac has a $100 card that has sockets for a 68030 and and FPU that goes in the 68020 direct slot of the LC. It seems like the II Si is a better buy. It is about $800 more than the LC at US univeristy prices.
curfmanm@cas.orst.edu (Matthew Curfmanm) (05/05/91)
>who cares :-) to go into a LC. Now, if I recall my Motorola manuals >correctly, your basic memory-manager-unit chip works with 68020's, >n'est-ce pas? So, how come I don't see adds for such beasties? > >A LC with MMU would seem to be a nice machine for the $$ - System >7.0<some_version_number> could use the MMU to do VM. > >Any ideas, > >Thanks in advance, >-- >Mike Norman,c/o Bell-Northern Research UUCP:...uunet!bnrgate!bcarh332!mwnorman I seem to remember that the reason a person can't add a MMU to the LC is because the MMU needs to sit between the memory and processor, so that it can perform the logical to physical address translations. Since Apple didn't leave a sockett available for this, since the processor is soldered to the board, and since the address lines go straight to the memory array, it would be difficult to add a MMU. This is just my understanding, and could be totaly wrong :) -- ______________________________________________________________________________ Matt Curfman Oregon State University curfmanm@cas.orst.edu Extension Computing Technology Unit Standard Disclaimer Applies
jcbeatty@lute.waterloo.edu (John C. Beatty) (05/08/91)
In article <6299@vela.acs.oakland.edu> bbesler@vela.acs.oakland.edu (Brent H. Besler) writes: >I believe that Dynamac has a $100 card that has sockets for a 68030 and >and FPU that goes in the 68020 direct slot of the LC. It seems like the >II Si is a better buy. It is about $800 more than the LC at US >univeristy prices. I understand from Dynamac that a problem has arisen with their 68030 product, and that they will be shipping an fpu-only board rather than a 68030/fpu board (for less money). The salesperson I spoke with claimed it was Apple's problem, and that with the existing logic board you cannot upgrade to an '030 ... more than that, I cannot say ...