31 Aug
2018
31 Aug
'18
8:35 p.m.
Trying to restore an Alpha Micro ColdFire-based system, and it's missing
its cache SIMM. It works without it, but it sure would be nice. AM doesn't
have much info on it but it appears to be a 72-pin 64KB SIMM (unknown
speed), same keying as 72-pin RAM SIMMs.
I doubt this is a custom part and ISTR that PCs of around that time used
something similar. If you've got something like this mouldering in your
parts drawer, please advise. Thanks!
--
------------------------------------ personal: http://www.cameronkaiser.com/ --
Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com
-- Heisenberg may have been here. ---------------------------------------------
31 Aug
31 Aug
9:37 p.m.
On 8/31/2018 8:35 PM, Cameron Kaiser via cctalk wrote:
Trying to restore an Alpha Micro ColdFire-based
system, and it's missing
its cache SIMM. It works without it, but it sure would be nice. AM doesn't
have much info on it but it appears to be a 72-pin 64KB SIMM (unknown
speed), same keying as 72-pin RAM SIMMs.
I doubt this is a custom part and ISTR that PCs of around that time used
something similar. If you've got something like this mouldering in your
parts drawer, please advise. Thanks!
I have three devices which if I remember right were cache modules, but
they all appear to be 80 pin devices.
Slightly longer pins than the typical 72-pin SIMMs, fit into a vertical
socket on the MB.? Any chance you've got the pin count wrong?
??? -Rick
1 Sep
1 Sep
12:41 p.m.
Trying to
restore an Alpha Micro ColdFire-based system, and it's missing
its cache SIMM. It works without it, but it sure would be nice. AM doesn't
have much info on it but it appears to be a 72-pin 64KB SIMM (unknown
speed), same keying as 72-pin RAM SIMMs.
I doubt this is a custom part and ISTR that PCs of around that time used
something similar. If you've got something like this mouldering in your
parts drawer, please advise. Thanks!
I have three devices which if I remember right were cache modules, but
they all appear to be 80 pin devices.
Slightly longer pins than the typical 72-pin SIMMs, fit into a vertical
socket on the MB. Any chance you've got the pin count wrong? 
11:44 p.m.
On September 1, 2018 9:41:37 AM PDT, Cameron Kaiser via cctalk <cctalk at
classiccmp.org> wrote:
but
I had a regular Pentium motherboard with cache like that. The manual describes this as
COAST for Cache On A Stick. The actual SIMM has gold fingers that are much longer than
the ones found on regular DRAM SIMMs. I curiously tried putting a regular SIMM into a
COAST slot and vice versa. It didn't work because of this length difference.
--
David Griffith
dave at 661.org
> Trying to
restore an Alpha Micro ColdFire-based system, and it's
missing
> its cache SIMM. It works without it, but it
sure would be nice. AM
doesn't
> have much info on it but it appears to be a
72-pin 64KB SIMM
(unknown
> speed), same keying as 72-pin RAM SIMMs.
>
> I doubt this is a custom part and ISTR that PCs of around that time
used
> something similar. If you've got
something like this mouldering in
your
parts
drawer, please advise. Thanks!
I have three devices which if I remember right were cache modules, they all appear to be 80 pin devices.
Slightly longer pins than the typical 72-pin SIMMs, fit into a
vertical
socket on the MB. Any chance you've got the
pin count wrong?
An excellent question, but it is exactly the same socket as the 72-pin
RAM
SIMMs below it. I even labouriously counted all the pins on the board
socket
this morning just in case I'd missed something, and it's 72. The
service
manual even warns against installing RAM there.
Is this actually a *non*-standard thing? I know Apple had all kinds of
boffo
L2 cache configurations for the beige Power Macs but Apple's Apple and
certainly larger than Alpha Micro.
--
------------------------------------ personal:
http://www.cameronkaiser.com/ --
Cameron Kaiser * Floodgap Systems * www.floodgap.com *
ckaiser at floodgap.com
-- Seen on hand dryer: "Push button for a message from your
congressman." ----- 
11 Sep
11 Sep
10:32 a.m.
On Sat, 1 Sep 2018, Cameron Kaiser via cctalk wrote:
An excellent question, but it is exactly the same
socket as the 72-pin RAM
SIMMs below it. I even labouriously counted all the pins on the board socket
this morning just in case I'd missed something, and it's 72. The service
manual even warns against installing RAM there.
Is this actually a *non*-standard thing? I know Apple had all kinds of boffo
L2 cache configurations for the beige Power Macs but Apple's Apple and
certainly larger than Alpha Micro.
I'd expect SRAM rather than DRAM on a cache SIMM. Cache memory is
supposed to be fast after all. Otherwise why bother? -- caching only
complicates things, so there has to be benefit in return.
Maciej
2141
days inactive
2151
days old
5 comments
5 participants
participants (5)
-
aek＠bitsavers.org -
dave＠661.org -
macro＠linux-mips.org -
rick＠rickmurphy.net -
spectre＠floodgap.com