13 May
2008
13 May
'08
10:19 p.m.
Does anybody know if the DEC8235 is the same as the
National DM8235?
Doesn't look likely. The DM8230 isn't the same as the Signetics 8230.
The DEC82xx parts seem to be the Signetics 82xx parts.
Mouser claims to be able to order NTE8235, but
there's no order pending or
delivery date. ($9.09 each.)
http://www.rselectronics.com/ seems to claim stock.
This company search says they have non NTE parts. I used them in 1999 to
get a part and the minimum order then was $50. http://www.hrent.com/inv.htm
Who knows what has changed since then, the search is using an outside site.
They also list the MM57109N from another message.
Post back if you do use them.
14 May
14 May
1:54 p.m.
The DEC82xx parts seem to be the Signetics 82xx parts.
FWIW, I can now confirm that the Signetics N8235 will work for the
DEC8235. Another collector kindly gave me a couple, and I'm set for those
now.
I replaced the 8235s and another bad IC on the TD8E that I found after
that (a DEC5380, which seems to be the same as the SP380, which is also the
8T380 which is also the DM8836 :-), and the TD8E appears to be OK.
Or at least better; it's still not working but now I'm convinced that
there's something funky going on inside the drive's electronics. I'll have
to track that down next.
Thanks again,
Bob
7:37 p.m.
djg at pdp8.net wrote:
http://www.hrent.com/inv.htm
They also list the MM57109N from another message.
Thanks for the headsup.
I sent them a RFQ for a price.
=Dan
--
[ Pittsburgh --- http://www2.applegate.org/~ragooman/ ]
8:07 p.m.
Dan wrote:
Thanks for the headsup.
I sent them a RFQ for a price.
Let us know if you get a reply. In my experience chip brokers won't
bother to reply even if you're offering $250 per line item
(e.g., 25 pieces at $10 each, or 5 pieces at $50 each).
The other thing about chip brokers is that they don't have ANY stock.
All they have is a subscription to some industry database or an
aggregation of databases, such as Loadparts. The database lists parts
that someone else somewhere claims to have. Naturally the broker will
not tell you who actually has the parts, since that would eliminate
their "usefulness" as a middleman.
Perhaps if you buy a Loadparts subscription you can find out who
really has the parts. I'm mildly tempted but haven't needed any
parts desperately enough to spend $150 for a three month subscription
to find out.
Hmmm... if there isn't any bigger entry barrier to becoming a parts
broker than a $50/month database subscription and putting up a cheesy
web site, maybe I should go into that business myself!
I'm probably expecting too much of what the Loadparts subscription
will do, though. It probably will mostly return results from
brokers, and not actually get one any closer to the actual sources.
Eric
8:24 p.m.
On Wednesday 14 May 2008 20:07, Eric Smith wrote:
Dan wrote:
If there were some easy way to exclude a lot of that BS from one's searches
that would be a truly useful thing.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
Thanks for the headsup.
I sent them a RFQ for a price.
Let us know if you get a reply. In my experience chip brokers won't
bother to reply even if you're offering $250 per line item
(e.g., 25 pieces at $10 each, or 5 pieces at $50 each).
The other thing about chip brokers is that they don't have ANY stock.
All they have is a subscription to some industry database or an
aggregation of databases, such as Loadparts. The database lists parts
that someone else somewhere claims to have. Naturally the broker will
not tell you who actually has the parts, since that would eliminate
their "usefulness" as a middleman.
Perhaps if you buy a Loadparts subscription you can find out who
really has the parts. I'm mildly tempted but haven't needed any
parts desperately enough to spend $150 for a three month subscription
to find out.
Hmmm... if there isn't any bigger entry barrier to becoming a parts
broker than a $50/month database subscription and putting up a cheesy
web site, maybe I should go into that business myself!
I'm probably expecting too much of what the Loadparts subscription
will do, though. It probably will mostly return results from
brokers, and not actually get one any closer to the actual sources.
Eric 
15 May
15 May
2:59 a.m.
On Wed, 2008-05-14 at 20:24 -0400, Roy J. Tellason wrote:
If there were some easy way to exclude a lot of that
BS from one's searches
that would be a truly useful thing.
Yes. I've found this with a lot of datasheet sites, where you end up
clicking through lots of pages of shite with "WE HELP YOU BUY BEST
PRICE!"-type messages, until you find that they want $5 for a PDF of a
datasheet.
Another one that's getting bad is people spamming the same product over
and over again on eBay - I was looking for a supercharger last night and
had to wade through 11 pages of the same crappy "electric supercharger"
PC case fan things, all advertised with different car manufacturer
names. I wish eBay had a way to exclude particular sellers from
searches.
Does anyone have the datasheet for an MM57109? How hard would it be to
make a replacement, either with an FPGA or a microcontroller or
something?
Gordon
3:52 a.m.
New subject: Excluding specific sellers from ebay searches (Was: DEC8235 and MM57109N ICs )
In article <1210834768.8126.7.camel at elric>,
Gordon JC Pearce <gordonjcp at gjcp.net> writes:
[...] I wish eBay had a way to exclude particular
sellers from
searches.
They do. On the advanced search options page there is a way to limit
searches either to include specific sellers only or exclude specific
sellers.
I use this to exclude "it equipment express" from all my ebay searches.
--
"The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download
<http://www.xmission.com/~legalize/book/download/index.html>
Legalize Adulthood! <http://blogs.xmission.com/legalize/>
7:58 a.m.
Gordon JC Pearce wrote:
Does anyone have the datasheet for an MM57109? How
hard would it be to
make a replacement, either with an FPGA or a microcontroller or
something?
I've had no luck whatsoever in finding a datasheet for this part.
I've been searching online for a long time too.
I only have the programming info from old projects.
But I too like to get the complete datasheet to check everything.
I'm hoping the folks at Area51esg would have a lead on this.
=Dan
--
[ Pittsburgh --- http://www2.applegate.org/~ragooman/ ]
9:40 a.m.
Yes. I've found this with a lot of datasheet
sites, where you end up
clicking through lots of pages of shite with "WE HELP YOU BUY BEST
PRICE!"-type messages, until you find that they want $5 for a PDF of a
datasheet.
If you live in Silicon Valley, then Halted has an excellent library of old
data books. Anybody is welcome to wander in and peruse them - it's really a
great resource.
Bob
3:50 p.m.
Does anyone have the datasheet for an MM57109?
If memory serves, the full datasheet is in the 1980 National
Semiconductor MOS Databook.
How hard would it be to make a replacement, either
with an FPGA or a
microcontroller or something?
It depends. Do you want it to be exactly as slow and inaccurate as the
real thing? That might be hard.
The original *was* a microcontroller, albeit a very slow 4-bit PMOS
microcontroller, so obviously there's an existence proof that it can
be done with a microcontroller.
Eric
14 May
14 May
11:33 p.m.
On May 14, 2008, at 8:07 PM, Eric Smith wrote:
--
Dave McGuire
Port Charlotte, FL
The other thing about chip brokers is that they
don't have ANY stock.
All they have is a subscription to some industry database or an
aggregation of databases, such as Loadparts. The database lists parts
that someone else somewhere claims to have. Naturally the broker will
not tell you who actually has the parts, since that would eliminate
their "usefulness" as a middleman.
Perhaps if you buy a Loadparts subscription you can find out who
really has the parts. I'm mildly tempted but haven't needed any
parts desperately enough to spend $150 for a three month subscription
to find out.
Hmmm... if there isn't any bigger entry barrier to becoming a parts
broker than a $50/month database subscription and putting up a cheesy
web site, maybe I should go into that business myself!
I'm probably expecting too much of what the Loadparts subscription
will do, though. It probably will mostly return results from
brokers, and not actually get one any closer to the actual sources.
It almost sounds like there needs to be a classiccmp pseudo-
company to take up a collection of money and buy a membership.
-Dave
5907
days inactive
5908
days old
10 comments
8 participants
participants (8)
-
bob＠jfcl.com -
djg＠pdp8.net -
eric＠brouhaha.com -
gordonjcp＠gjcp.net -
legalize＠xmission.com -
mcguire＠neurotica.com -
ragooman＠comcast.net -
rtellason＠verizon.net