16 Feb
2010
16 Feb
'10
4:31 p.m.
Chuck Guzis wrote:
On 12 Feb 2010 at 15:30, Jeff Walther wrote:
> Anyone have a datasheet for the MCM62940
(MCM62940AFN14) static RAM?
> It's not strictly off topic, as it's from the 256K level 2 cache of a
> computer from the mid-90s (NuBus PPC Macintoshes).
Apparently, the MCM62486 is pin compatible and there
are datasheets
for that online:
--Chuck
Thanks you for the information, Chuck. They should be very similar. I
imagine the difference is that the XX486 version has adaptations for the
80486 methods of addressing memory, while the 940 version is more oriented
for the Motorola family of processors. At least, I think I read
something to that effect somewhere--maybe in the description of the
associated tag RAM.
Anyway, I've emailed Brent and hope to pay to ship the whole databook.
If anyone else decides they want to order the 4000 soldered down static
RAMs I referenced (they have 19 batches in stock), I can scan the
datasheet after I have the book--if I can get the scanner working again.
Darned glass fell out because the manufacturer's double sided tape got old
(it's more than 10 years old too). I tried a 3M tape
<http://www.shop3m.com/3m-high-performance-double-coated-tape-9088-fl3znfcqj3.html?WT.z_xsell=1&WT.z_refSKU=3M-HIGH-PERFORMANCE-DOUBLE-COATED-TAPE-9086-56Q9TKZKD9>
that looked promising but it didn't hold. I'm going to try again and
heat the tape and give it three days to set. On the first try I didn't
see the information that the adhesive needs to set for three days.
Who knew that one needs to read the datasheet on *adhesive tape* in order
to use it properly?
Jeff Walther
16 Feb
16 Feb
6:05 p.m.
On 16 Feb 2010 at 10:31, Jeff Walther wrote:
Darned glass fell out because the manufacturer's
double sided tape got
old (it's more than 10 years old too). I tried a 3M tape
<http://www.shop3m.com/3m-high-performance-double-coated-tape-9088-fl3
znfcqj3.html?WT.z_xsell=1&WT.z_refSKU=3M-HIGH-PERFORMANCE-DOUBLE-COATE
D-TAPE-9086-56Q9TKZKD9>
that looked promising but it didn't hold. I'm going to try again and
heat the tape and give it three days to set. On the first try I
didn't see the information that the adhesive needs to set for three
days.
I'm using a lot of polyurethane glue (e.g. "Gorilla Glue") nowadays.
I used to use it quite a bit in woodworking (it's stainable and fills
gaps) until my wife asked me to repair a hairclip of hers constructed
of a metal clip affixed to a glass decorative element. Epoxy
wouldn't stick to the glass no matter what I did and I was about to
reach for the RTV, when I wondered about the polyurethane. Years
later, it's still holding. I use it to tack down components to bare
FR4 PCB, where I want a bit more strength. I've replaced the double-
sided tape on cable clips with it. The great part is that it can be
cut with a utility knife and cleaned up or removed once it's set.
It just might do the job on your scanner--but use it very sparingly.
It expands when it cures.
--Chuck
7:49 p.m.
Gorilla Glue is good stuff. I've used it to repair the door panels in my car. They
still hold together quite well. :)
________________________________
From: Chuck Guzis <cclist at sydex.com>
To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
Sent: Tue, February 16, 2010 12:05:02 PM
Subject: Re: OT: Datasheet for Motorola MCM62940 32K X 9 SRAM?
On 16 Feb 2010 at 10:31, Jeff Walther wrote:
Darned glass fell out because the manufacturer's
double sided tape got
old (it's more than 10 years old too). I tried a 3M tape
<http://www.shop3m.com/3m-high-performance-double-coated-tape-9088-fl3
znfcqj3.html?WT.z_xsell=1&WT.z_refSKU=3M-HIGH-PERFORMANCE-DOUBLE-COATE
D-TAPE-9086-56Q9TKZKD9>
that looked promising but it didn't hold. I'm going to try again and
heat the tape and give it three days to set. On the first try I
didn't see the information that the adhesive needs to set for three
days.
I'm using a lot of polyurethane glue (e.g. "Gorilla Glue") nowadays.
I used to use it quite a bit in woodworking (it's stainable and fills
gaps) until my wife asked me to repair a hairclip of hers constructed
of a metal clip affixed to a glass decorative element. Epoxy
wouldn't stick to the glass no matter what I did and I was about to
reach for the RTV, when I wondered about the polyurethane. Years
later, it's still holding. I use it to tack down components to bare
FR4 PCB, where I want a bit more strength. I've replaced the double-
sided tape on cable clips with it. The great part is that it can be
cut with a utility knife and cleaned up or removed once it's set.
It just might do the job on your scanner--but use it very sparingly.
It expands when it cures.
--Chuck
5500
days inactive
5500
days old
2 comments
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