2 Oct
2000
2 Oct
'00
12:38 p.m.
Hi,
As my transputer collection increases, I just received a broken BBK-S4 (Sparc-based SBUS
transputer link adapter). As far as I can tell, the only broken piece is the firmware IC.
The IC actually was broken in half exposing the actual IC. I think someone was trying to
extract it incorrectly and it opened up. The delicate wires are snapped as well. I hope
that the firmware is downloaded to the chip each time it is fired up, but I am not sure.
The chip is labelled as:
TOSHIBA
TC57H256D-70
JAPAN 8906YAA
VPP 12.5V
Does anyone know what type of IC this is and where I can obtain one? I would love to
install this on my IPX and connect my T805-30MHz Xplorer to it. Thanks
Ram
2 Oct
2 Oct
9:16 a.m.
From: "Ram Meenakshisundaram"
<rmeenaks(a)olf.com>
To: <classiccmp(a)classiccmp.org>
Subject: Need help identifying the following IC/CHIP
Date: Mon, 2 Oct 2000 20:38:09 -0400
Reply-to: classiccmp(a)classiccmp.org
Hi,
As my transputer collection increases, I just received a broken BBK-S4 (Sparc-based SBUS
transputer link adapter). As far as I can tell, the only broken piece is the firmware IC.
The IC actually wa>
TOSHIBA
TC57H256D-70
JAPAN 8906YAA
VPP 12.5V
Does anyone know what type of IC this is and where I can obtain one? I would love to
install this on my IPX and connect my T805-30MHz Xplorer to it. Thanks
Ram
Hi,
That chip is eprom 32K x 8bit 70ns, you need to get data from
another who have extracted actual data from their intact eprom for
that board and have someone else burn a replacement eprom. Doesn't
have to be toshiba chip. Cost is not that expensive, appox 5 dollars
for suitable used or new blanks and labour cost.
That type of package, I find this hard to believe that can be broken
unless someone snaps this in two intentionally. Prying won't do
that. This takes real effort to break one even plastic ones is still
hard to break without some kind of impact or gripped between two
pliers. WHY?
Years ago, I used to split open old lidless ceramic "sandwich" style
ICs with a hammer and a chisel on it's seam. It takes hard blow to
do it. Even 14pin ceramic sandwich is hard to split open.
Cheers!
Wizard
1:59 p.m.
Well...
Looks like an EPROM. I imagine there was a glass window on top of the
chip...More or less the equivalent of floppy disk on a chip. Copied with
an EPROM programmer. Good luck in finding someone that can copy an
identical one for you...
Claude
Ram Meenakshisundaram wrote:
Hi,
As my transputer collection increases, I just received a broken BBK-S4
(Sparc-based SBUS transputer link adapter). As far as I can tell, the
only broken piece is the firmware IC. The IC actually was broken in
half exposing the actual IC. I think someone was trying to extract it
incorrectly and it opened up. The delicate wires are snapped as
well. I hope that the firmware is downloaded to the chip each time it
is fired up, but I am not sure. The chip is labelled as:
TOSHIBA
TC57H256D-70
JAPAN 8906YAA
VPP 12.5V
Does anyone know what type of IC this is and where I can obtain one?
I would love to install this on my IPX and connect my T805-30MHz
Xplorer to it. Thanks
Ram
6:19 a.m.
> Looks like an EPROM. I imagine there was a
glass...
Hopefully a *quartz* window. Otherwise it will be
difficult to erase.
Hey I'm just an initiate on these things. Most modern
EPROMs seem to have poured (once liquid) windows, older
ones have the sliced crystalline slab windows. You mean
to say thet the solidified windows are quartz also?
I thought the M.P. of Quartz was astronomically high.
John A.
6:29 a.m.
"John Allain" <John.Allain(a)donnelley.infousa.com> wrote:
yes
> Looks like an EPROM. I imagine there was a
glass...
Hopefully a *quartz* window. Otherwise it will
be
difficult to erase.
Hey I'm just an initiate on these things. Most modern
EPROMs seem to have poured (once liquid) windows, older
ones have the sliced crystalline slab windows. You mean
to say thet the solidified windows are quartz also? I thought the M.P. of Quartz was astronomically high.
also yes
Dwight
4 Oct
4 Oct
4:46 a.m.
> Hey I'm just an initiate on these things.
Most modern
> EPROMs seem to have poured (once liquid) windows, older
> ones have the sliced crystalline slab windows. You mean
> to say thet the solidified windows are quartz also?
yes
> I thought the M.P. of Quartz was astronomically
high.
also yes
Actually I hoping that someone had neat stories on
How< Quartz could be molded like glass so cheaply.
I get the impression that there is nothing special about
EPROM windows... until you hear that they're Quartz.
John A.
5:16 a.m.
"John Allain" <John.Allain(a)donnelley.infousa.com> wrote:
Actually I hoping that someone had neat stories on
Hi John
The lids you are talking about are quartz windows in
ceramic lids. From what I remember, the quartz is melted
into the ceramic and then allowed to cool. The ceramic
doesn't melt and has a slightly higher coefficient of
expansion. This forms a air tight seal. It is done
in an induction oven under a soft vacuum so heating isn't
a big issue.
Dwight
How< Quartz could be molded like glass so
cheaply.
I get the impression that there is nothing special about
EPROM windows... until you hear that they're Quartz.
John A. 
3 Oct
3 Oct
7:15 a.m.
I wrote:
Hopefully a *quartz* window. Otherwise it will be
difficult to erase.
John A. wrote:
Hey I'm just an initiate on these things. Most
modern
EPROMs seem to have poured (once liquid) windows, older
ones have the sliced crystalline slab windows. You mean
to say thet the solidified windows are quartz also?
I thought the M.P. of Quartz was astronomically high.
I'm not sure. But glass is fairly opaque to shortwave UV,
so a glass window won't work too well.
I have some OKI plastic-packaged EPROMs that have a
plastic window. The window is translucent to visible
light, but apparently reasonably opaque to shortwave UV.
OKI didn't make them for very long; I guess they weren't
a big hit. I've heard that the window becomes less
transparent to UV as exposure increases.
6:32 a.m.
Eric Smith wrote:
Hopefully a *quartz* window. Otherwise it will be
difficult to erase.
Well, you could leave it on Mir for a few hours, and let the fungi get
to it. That should take care of erasing problems. :)
http://www.globe.com/dailyglobe2/275/nation/Astronauts_vs_fungus+.shtml
And I thought getting dust in my Indigo was a pain in the...
--
Tim Harrison
Network Engineer
harrison(a)timharrison.com
http://www.networklevel.com/
8:16 a.m.
New subject: OT: Life found in Space! was Re: Need help identifying the following IC/CHIP
At 02:32 PM 10/3/00 -0400, you wrote:
Eric Smith wrote:
This is a hoot! You have to read it!
Joe
Hopefully a *quartz* window. Otherwise it will
be difficult to erase.
Well, you could leave it on Mir for a few hours, and let the fungi get
to it. That should take care of erasing problems. :)
http://www.globe.com/dailyglobe2/275/nation/Astronauts_vs_fungus+.shtml 
5:27 a.m.
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6:30 a.m.
Hi,
Thanks for all the responses. I figured it was some type of
EPROM/EEPROM. There is a clear window on the chip itself. I dont know
why someone would want to pry open the IC itself. Maybe it was faulty
to begin with and they wanted to try to fix it?? As for getting a
replacement, this is probably going to be impossible. I specifically
dont know anyone else who would have one for me to dump and reload into
a new IC. This bites with a capital B! Its such a nice board too....
Ram
30 Nov
30 Nov
5:10 a.m.
New subject: Need help identifying the following IC/CHIP - The next saga
Hi,
Thanks for everyone who helped identify this EPROM chip. I just got yet
another BBK-S4 that works. What I want to do is get a replacement EPROM
so that I can fix the first board. Anyone know where I can get this
chip from???
Ram
Ram Meenakshisundaram wrote:
Hi,
As my transputer collection increases, I just received a broken BBK-S4
(Sparc-based SBUS transputer link adapter). As far as I can tell, the
only broken piece is the firmware IC. The IC actually was broken in
half exposing the actual IC. I think someone was trying to extract it
incorrectly and it opened up. The delicate wires are snapped as
well. I hope that the firmware is downloaded to the chip each time it
is fired up, but I am not sure. The chip is labelled as:
TOSHIBA
TC57H256D-70
JAPAN 8906YAA
VPP 12.5V
Does anyone know what type of IC this is and where I can obtain one?
I would love to install this on my IPX and connect my T805-30MHz
Xplorer to it. Thanks
Ram
8549
days inactive
8608
days old
13 comments
9 participants
participants (9)
-
ard＠p850ug1.demon.co.uk -
claudew＠funcow.com -
elvey＠hal.com -
eric＠brouhaha.com -
harrison＠timharrison.com -
John.Allain＠donnelley.infousa.com -
jpero＠sympatico.ca -
rigdonj＠intellistar.net -
rmeenaks＠olf.com