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Date Posted: 02:14:17 01/05/02 Sat
Author: Stuart Bell
Subject: 575 L2 cache cards - the Revised Version!

Hi! After I posted Scott Barber's narrative last night, and emailed him to thank him, he responded with a major correction. He'd remembered the 'issues' surrounding the use of a cache on the 575 right, but 'misremembered' the make and model of the card, confuing MicroMac with Sonnet! I've therefore edited his original response in the light of his amendments, deleted the first thread, and am posting first the corrected initial response, then the followup!

Scott wrote: Now---for the Notes about the 575 problems....

The 575 motherboard was built just a bit differently from the other 040
motherboards---don't laugh---I know it sounds ridiculous for me to say
that--that the appearance of the board is obvious, but I'm specifically
talking about the orientation of the processor socket.

In almost all apple 040 motherboards---and I'll use the Quadra 610 as an
example---There was enough room to the left of the processor to physically
space another processor. When cache cards were made for these machines,
they were physically keyed to go on the left of the processor socket--based
on the orientation of the processor's Key mark. The 575 turned the
processor around---leaving no room for the adapter card to go to the left.

At this moment, I don't remember the exact layout of the 575
motherboard---It might be that the adapter card I'm describing simply
blocked the motherboard slots, so that no upgrade cards could be installed
with the adapter card installed, but that's something you'll have to
consider yourself---if you don't intend to use the adapter slots, that is
fine, and the adapter card will fit.

Depending on how technically minded you are, and dependent on how much labor
you want to expend on this it is possible to make a processor adapter cable that would extrude
from the motherboard socket through the back of the case where a normal
micromac adapter card could be attached, adhered to the back of the case
with double sided sticky tape, and thus be successful in installing the L2
cache unit. It involves purchasing two 040 board mount sockets (not surface
mount), having the ability to understand how to solder in small, meticulous
spaces, and reorienting/plotting ribbon cables into the top of a processor
socket---all without exceeding a length of 8 inches from processor socket to
your custom built adapter socket. This would make a processor "extender" socket, which would work.

The question of course is---is this kind of stuff a hobby for you that you'd
be willing to try--or is the machine you're futzing with too necessary in
your life for you to take experimental chances with.

Note: The L2 cache that came on these adapter cards has the capablity of
running at 175mhz, so no matter what chip you ultimately decide to install,
do not worry about the speed of the L2 cache---it will always work fine.

contd. . . . .

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Replies:

Re: 575 L2 cache cards - the Revised Version! -- Stuart Bell, 02:18:25 01/05/02 Sat
- 575 L2 cache cards - the Revised Version! -- jack honeycutt, 03:36:22 01/05/02 Sat
  - Re: 575 L2 cache cards - the Revised Version! -- Stuart Bell, 03:54:23 01/05/02 Sat
    - MicroMac CACHE cards -- jack honeycutt, 07:25:28 01/05/02 Sat
      - Re: MicroMac CACHE cards -- Stuart Bell, 08:23:16 01/05/02 Sat
        Re: MicroMac CACHE cards -- jack honeycutt, 17:29:22 01/05/02 Sat
        Re: MicroMac CACHE cards -- Stuart Bell, 07:02:47 01/06/02 Sun