10 Jun
2010
10 Jun
'10
2:13 a.m.
Does anyone here know of a decent supply of 29c256 flash EEPROM chips or a
drop-in replacement? I'm having a nasty time trying to source these for
the P112 project.
--
David Griffith
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
10 Jun
10 Jun
2:33 a.m.
On 10/06/2010 07:13, David Griffith wrote:
Does anyone here know of a decent supply of 29c256 flash EEPROM chips or
a drop-in replacement? I'm having a nasty time trying to source these
for the P112 project.
Farnell have several 28c256 chips which are pin compatible.
Cheers.
Phill.
3:04 a.m.
On Thu, 10 Jun 2010, Phill Harvey-Smith wrote:
On 10/06/2010 07:13, David Griffith wrote:
Ugh! 9 pounds each? I need to buy around 90 of these.
The P112 was designed with a 32-pin socket for the boot ROM, so a 29F010
(which I found for a good price) looks like it would work as long as pins
1 and 2 are grounded. I'm not quite sure yet. Now to find whatever old
version of Protel Dave Brooks used. I should be able to make the change
by directly modifying the gerbers, I guess.
I'm going to go to bed tonight rather annoyed. Damn chips going out of
production then the price goes sky-high.
--
David Griffith
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
Does anyone here know of a decent supply of 29c256 flash EEPROM chips or
a drop-in replacement? I'm having a nasty time trying to source these
for the P112 project.
Farnell have several 28c256 chips which are pin compatible. 
3:17 a.m.
On 6/10/10 3:04 AM, David Griffith wrote:
Ugh! 9 pounds each? I need to buy around 90 of these.
The P112 was designed with a 32-pin socket for the boot ROM, so a 29F010
(which I found for a good price) looks like it would work as long as
pins 1 and 2 are grounded. I'm not quite sure yet. Now to find
whatever old version of Protel Dave Brooks used. I should be able to
make the change by directly modifying the gerbers, I guess.
I'm going to go to bed tonight rather annoyed. Damn chips going out of
production then the price goes sky-high.
There seem to be quite a few 28F256s on eBay, you might be able to get
the required quantity there. One is listed as "more than 10
available"...I just bought some parts from that seller ("eedesigner"),
he seems to have HUGE stocks of things.
-Dave
--
Dave McGuire
Port Charlotte, FL
Does anyone here know of a decent supply of 29c256
flash EEPROM chips or
a drop-in replacement? I'm having a nasty time trying to source these
for the P112 project.
Farnell have several 28c256 chips which are pin compatible. 
3:58 a.m.
heres an auction for six at $2.80 each
http://cgi.ebay.ca/RC28F256J3-256MB-Intel-StrataFlash-Memory-Flash-28F256_W…
asof writing there is 43 here
http://cgi.ebay.ca/28F256-32k-150ns-CMOS-Flash-Memory-DIP_W0QQitemZ20028877…
On 6/10/10, Dave McGuire <mcguire at neurotica.com> wrote:
On 6/10/10 3:04 AM, David Griffith wrote:
Ugh! 9 pounds each? I need to buy around 90 of these.
The P112 was designed with a 32-pin socket for the boot ROM, so a 29F010
(which I found for a good price) looks like it would work as long as
pins 1 and 2 are grounded. I'm not quite sure yet. Now to find
whatever old version of Protel Dave Brooks used. I should be able to
make the change by directly modifying the gerbers, I guess.
I'm going to go to bed tonight rather annoyed. Damn chips going out of
production then the price goes sky-high.
There seem to be quite a few 28F256s on eBay, you might be able to get
the required quantity there. One is listed as "more than 10
available"...I just bought some parts from that seller ("eedesigner"),
he seems to have HUGE stocks of things.
-Dave
--
Dave McGuire
Port Charlotte, FL
>> Does anyone here know of a decent supply
of 29c256 flash EEPROM chips
or
a drop-in replacement? I'm having a nasty time
trying to source these
for the P112 project.
Farnell have several 28c256 chips which are pin compatible. 
12:21 p.m.
On 9 Jun 2010 at 23:13, David Griffith wrote:
Does anyone here know of a decent supply of 29c256
flash EEPROM chips
or a drop-in replacement? I'm having a nasty time trying to source
these for the P112 project.
Any chance of using the 27F256 Flash chips? Futurlec sells them for
USD$1.90 the each. Different programming algorithm (Vpp = +12), but
compatible pinout on read.
FWIW,
Chuck
4:02 p.m.
Hi
Why not use a 29C512 and just tie the extra address?
Jameco listed at $2.39 but not in dip.
Dwight
From: cclist at sydex.com
To: cctalk at classiccmp.org
Date: Thu, 10 Jun 2010 09:21:58 -0700
Subject: Re: seeking atmel 29c256
On 9 Jun 2010 at 23:13, David Griffith wrote:
_________________________________________________________________
The New Busy is not the old busy. Search, chat and e-mail from your inbox.
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Does anyone here know of a decent supply of
29c256 flash EEPROM chips
or a drop-in replacement? I'm having a nasty time trying to source
these for the P112 project.
Any chance of using the 27F256 Flash chips? Futurlec sells them for
USD$1.90 the each. Different programming algorithm (Vpp = +12), but
compatible pinout on read.
FWIW,
Chuck
4:39 p.m.
On Jun 10, 2010, at 1:02 PM, dwight elvey wrote:
Hi
Why not use a 29C512 and just tie the extra address?
Jameco listed at $2.39 but not in dip.
Not to speak for Dave (who's more than capable of speaking for his own damn self), it
probably needs to be DIP. It is one of the kit components the end-user solders in (well,
you solder in a socket, then snap the chip in the socket, but whatever). I believe
redesigning it for a PLCC or other surface-mount package would require a pretty
significant board redesign on Dave's part.
Not to mention the additional benefit to having it in a DIP package: it means it can be
swapped out if desired for different firmware (although I don't know of anybody
actively doing it with the P112).
4:46 p.m.
On Thu, 10 Jun 2010, A. Christoff Baumann wrote:
On Jun 10, 2010, at 1:02 PM, dwight elvey wrote:
Yeah, I need dip. As for redesigning the P112 from the ground up, that's
not out of the question. This hassle with tracking down parts going
obsolete has made me ponder that. Fortunately the super-io and cpu are
still being made and don't appear to be going away any time soon.
--
David Griffith
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
Hi
Why not use a 29C512 and just tie the extra address?
Jameco listed at $2.39 but not in dip.
Not to speak for Dave (who's more than capable of speaking for his own
damn self), it probably needs to be DIP. It is one of the kit
components the end-user solders in (well, you solder in a socket, then
snap the chip in the socket, but whatever). I believe redesigning it
for a PLCC or other surface-mount package would require a pretty
significant board redesign on Dave's part.
Not to mention the additional benefit to having it in a DIP package: it
means it can be swapped out if desired for different firmware (although
I don't know of anybody actively doing it with the P112).
6:17 p.m.
Date: Thu, 10 Jun 2010 13:46:42 -0700
From: dgriffi at cs.csubak.edu
To: cctalk at classiccmp.org
Subject: Re: seeking atmel 29c256
On Thu, 10 Jun 2010, A. Christoff Baumann wrote:
Hi
I did some more searching and they do have a 32 pin dip listed
on a catalog page but it doesn't show on their web search.
On page 17, they have:
Part# 242552CG
29C512-12
DIP-32 5V
$5.25 single
$4.25 10ea
This isn't in their current paper catalog but does show on one of
their reference catalog pages for flash memory.
It should be worth a call. 1-800-831-4242
Dwight
_________________________________________________________________
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On Jun 10, 2010, at 1:02 PM, dwight elvey wrote:
Yeah, I need dip. As for redesigning the P112 from the ground up, that's
not out of the question. This hassle with tracking down parts going
obsolete has made me ponder that. Fortunately the super-io and cpu are
still being made and don't appear to be going away any time soon.
Hi
Why not use a 29C512 and just tie the extra address?
Jameco listed at $2.39 but not in dip.
Not to speak for Dave (who's more than capable of speaking for his own
damn self), it probably needs to be DIP. It is one of the kit
components the end-user solders in (well, you solder in a socket, then
snap the chip in the socket, but whatever). I believe redesigning it
for a PLCC or other surface-mount package would require a pretty
significant board redesign on Dave's part.
Not to mention the additional benefit to having it in a DIP package: it
means it can be swapped out if desired for different firmware (although
I don't know of anybody actively doing it with the P112).
4:40 p.m.
On Thu, 10 Jun 2010, dwight elvey wrote:
>> Does anyone here know of a decent supply of
29c256 flash EEPROM chips
>> or a drop-in replacement? I'm having a nasty time trying to source
>> these for the P112 project.
>
> Any chance of using the 27F256 Flash chips? Futurlec sells them for
> USD$1.90 the each. Different programming algorithm (Vpp = +12), but
> compatible pinout on read.
Hi
Why not use a 29C512 and just tie the extra address?
Jameco listed at $2.39 but not in dip.
Dwight
Unfortunately dip is what I need.
--
David Griffith
dgriffi at cs.csubak.edu
5133
days inactive
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days old
10 comments
7 participants
participants (7)
-
afra＠aurigae.demon.co.uk -
cclist＠sydex.com -
dgriffi＠cs.csubak.edu -
dkelvey＠hotmail.com -
feedle＠feedle.net -
halarewich＠gmail.com -
mcguire＠neurotica.com