15 May
15 May
3:45 a.m.
A truly beautiful work of insanity.... two thumbs up!
Curt
liste(a)artware.qc.ca wrote:
5:47 a.m.
On Tue, 15 May 2001, Curt Vendel wrote:
A truly beautiful work of insanity.... two thumbs up!
A waste of a VAX :( Two big thumbs down.
liste(a)artware.qc.ca wrote:
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
7:20 a.m.
On Tuesday, May 15, 2001, at 10:47 AM, Sellam Ismail wrote:
On Tue, 15 May 2001, Curt Vendel wrote:
The interior had already been stripped of usable parts prior to him
rescuing the cabinet so at least it was rescued vice going to the dump
or scrapped.
Jeff
A truly beautiful work of insanity.... two thumbs
up!
A waste of a VAX :( Two big thumbs down.
9:13 a.m.
On Tue, 15 May 2001, Jeff Hellige wrote:
On Tuesday, May 15, 2001, at 10:47 AM, Sellam Ismail
wrote:
I just don't want to encourage the destruction of other innocent VAXen :)
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
On Tue, 15 May 2001, Curt Vendel wrote:
The interior had already been stripped of usable parts prior to him
rescuing the cabinet so at least it was rescued vice going to the dump
or scrapped. A truly beautiful work of insanity.... two thumbs
up!
A waste of a VAX :( Two big thumbs down.
2:02 p.m.
Before you know it there will be 3400's used as nightstands, 8000's as wardrobes
or refrigerators, 4000's used as kitchen cabinets. Heaven forbid this becomes
"fashionable" suddenly the innocent slaughtering of vaxen's could become
rampant,
only 2nd to animal furs.... protestors will have to picket outside of Peir 1's
and Ikea's and instead of throwing red paint, they'll throw MMJ connectors and
cabinet assembly bolts at people buying these attrocities....
Sorry Sellam, I couldn't resist :-)
Curt
Sellam Ismail wrote:
On Tue, 15 May 2001, Jeff Hellige wrote:
On Tuesday, May 15, 2001, at 10:47 AM, Sellam
Ismail wrote:
I just don't want to encourage the destruction of other innocent VAXen :)
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org On Tue, 15 May 2001, Curt Vendel wrote:
The interior had already been stripped of usable parts prior to him
rescuing the cabinet so at least it was rescued vice going to the dump
or scrapped. A truly beautiful work of insanity.... two thumbs
up!
A waste of a VAX :( Two big thumbs down. 
11:42 a.m.
That isn't too far from the truth. Tell a classic mac zealot you made a
fishtank out of an original mac and you'll get a similar reaction, I imagine.
I wouldn't do it to the SE30 we have - it does useful work as a network terminal
(telnet, fetch, etc) and my wife would shoot me. It's her first personal computer.
In general I agree that a system should be restored if possible, but there are two
mitigating factors: 1. The vax had already been gutted, and 2. 11/780s aren't
especially uncommon. It WOULD be a tragedy if one of the wierd vaxen got made
into a bar - a 9000, for example. But the 11/780 sold zillions - it launched
the 32 bit minicomputer universe.
Speaking of which, does anyone out there HAVE a Vax 9000?
Before you know it there will be 3400's used as
nightstands, 8000's as wardrobes
or refrigerators, 4000's used as kitchen cabinets. Heaven forbid this becomes
"fashionable" suddenly the innocent slaughtering of vaxen's could become
rampant,
only 2nd to animal furs.... protestors will have to picket outside of Peir 1's
and Ikea's and instead of throwing red paint, they'll throw MMJ connectors and
cabinet assembly bolts at people buying these attrocities....
Sorry Sellam, I couldn't resist :-)
Bait Sellam at your own risk, he seems to
have an itchy "flame" finger. :)
--
Jim Strickland
jim(a)DIESPAMMERSCUMcalico.litterbox.com
-----------------------------------------------------------------------
BeOS Powered!
-----------------------------------------------------------------------
3:09 p.m.
On Tue, 15 May 2001, Jim Strickland wrote:
Bait Sellam at your own risk, he seems to have an
itchy "flame"
finger. :)
Only for you, Jimbo ;)
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
19 May
19 May
10:20 a.m.
Jim Strickland wrote:
2. 11/780s aren't
especially uncommon. It WOULD be a tragedy if one of the wierd vaxen got made
into a bar - a 9000, for example. But the 11/780 sold zillions - it launched
the 32 bit minicomputer universe.
Yes, but nevertheless they're hard to find these days. I bet there's about
no IT department that still runs one. Most of them are probably already
scrapped and some of them may reside in warehouses with those trade-used-
parts-for-twice-the-price dealerships. Since there's no demand of the kind
who would pay those high prices anymore, the last guard will probably see
the scrapyard in masses (with far less oportunity for someone to rescue
them.)
In short, *because* the 11/780 was both so popular and beautiful, it is a
tragedy for each one that goes.
sniff,
-Gunther
--
Gunther Schadow, M.D., Ph.D. gschadow(a)regenstrief.org
Medical Information Scientist Regenstrief Institute for Health Care
Adjunct Assistent Professor Indiana University School of Medicine
tel:1(317)630-7960 http://aurora.regenstrief.org
20 May
20 May
5:06 a.m.
Jim Strickland wrote:
> 2. 11/780s aren't
> especially uncommon. It WOULD be a tragedy if one of the wierd vaxen got made
> into a bar - a 9000, for example. But the 11/780 sold zillions - it launched
> the 32 bit minicomputer universe.
Agreed...
Yes, but nevertheless they're hard to find these days. I bet there's about
no IT department that still runs one. Most of them are probably already
scrapped and some of them may reside in warehouses with those trade-used-
parts-for-twice-the-price dealerships. Since there's no demand of the kind
who would pay those high prices anymore, the last guard will probably see
the scrapyard in masses (with far less oportunity for someone to rescue
them.)
Considering they've got less processing power than a '386'
they're not going to be found in any IS department. Almost all of the
ones I knew in IS -- (and I worked at DEC and installed a ton of them)
were upgraded to 11/785's in the mid to late 80's and in the 90's
they were long since scrapped out.
In short, *because* the 11/780 was both so popular and
beautiful, it is a
tragedy for each one that goes.
sniff,
-Gunther
I love 11/780's but I can't see them being run at home. The
cost/benefit ratio isn't right. You can run a full cluster of
Microvax systems for a lot less than 1 11/780 and you can blow the doors
off the older machine with them.jj
--
Gunther Schadow, M.D., Ph.D. gschadow(a)regenstrief.org
Medical Information Scientist Regenstrief Institute for Health Care
Adjunct Assistent Professor Indiana University School of Medicine
tel:1(317)630-7960 http://aurora.regenstrief.org
Bill
---
Bill Gates is a Persian cat and a monocle away from being a
villain in a James Bond movie -- Dennis Miller
bpechter@shell.monmouth.com|pechter@pechter.dyndns.org
9:18 a.m.
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24 May
24 May
2:59 a.m.
Gunther Schadow wrote:
Jim Strickland wrote:
The 11/780's that once sat in our computer center are long gone.
However, we still have an 8650 (11/795). It's twin went to the scrap
yard last year. There was no attempt to resell it, or the myriad of
other DEC items that were removed from service at that time. They were
all left standing in the rain before the local scrap dealer hauled them
away. I was able to salvage some parts from the 8650 before we got rid
of it, but it would have been impossible to have ever run the system
outside a data center environment. The size, weight, massive cooling
requirements and the 3 phase, 60 amp power circuit would prevent such a
system from being a practical hobbyist computer. It's a shame to see
them go, but there is not much else that can be done with them (except
for making more VAX bars).
--
Doug Carman
pdp11(a)bellsouth.net
2. 11/780s aren't
especially uncommon. It WOULD be a tragedy if one of the wierd vaxen got made
into a bar - a 9000, for example. But the 11/780 sold zillions - it launched
the 32 bit minicomputer universe.
Yes, but nevertheless they're hard to find these days. I bet there's about
no IT department that still runs one. Most of them are probably already
scrapped and some of them may reside in warehouses with those trade-used-
parts-for-twice-the-price dealerships. Since there's no demand of the kind
who would pay those high prices anymore, the last guard will probably see
the scrapyard in masses (with far less oportunity for someone to rescue
them.) 
11:10 a.m.
On Thu, 24 May 2001, Doug Carman wrote:
all left standing in the rain before the local scrap
dealer hauled them
away. I was able to salvage some parts from the 8650 before we got rid
of it, but it would have been impossible to have ever run the system
outside a data center environment. The size, weight, massive cooling
requirements and the 3 phase, 60 amp power circuit would prevent such a
system from being a practical hobbyist computer. It's a shame to see
Correct me if I'm wrong, but I seem to recall there being people on
this list who do use such systems at home.
--
Copyright (C) 2001 R. D. Davis The difference between humans & other animals:
All Rights Reserved an unnatural belief that we're above Nature &
rdd(a)perqlogic.com 410-744-4900 her other creatures, using dogma to justify such
http://www.perqlogic.com/rdd beliefs and to justify much human cruelty.
2:29 p.m.
----- Original Message -----
From: "R. D. Davis" <rdd(a)smart.net>
To: <classiccmp(a)classiccmp.org>
Sent: Friday, May 25, 2001 5:40 AM
Subject: Re: VAX bar
Correct me if I'm wrong, but I seem to recall
there being people on
this list who do use such systems at home.
8600 series Vaxen used ECL and were good substitutes for a central
heating system,
requiring some serious environmental control.
I'm not sure of the power requirements, but they were quite high, even
for the era, a Vax 6000 is a PC in comparison.
Cheers
Geoff in Oz
7:49 p.m.
"R. D. Davis" wrote:
On Thu, 24 May 2001, Doug Carman wrote:
That would be doubtful, but not totally impossible. It would be
interesting to hear from anyone who has one of the large VAX-11
computers for a hobby system. Other VAX systems might be more suitable
for home use, but the 11/780 through 8650 were massive power hogs. I
still have the power plug and receptacle from one of our 8650's. People
are always amazed that it was used to power a single computer. A 60 amp
3 phase circuit is out of the range of any type of residential electric
service.
However, I do run a PDP-11/70 at home. The PDP-11 systems are more
easily adapted to residential power because most of the system
components use 120V single phase power. Even though it can be done, it
still draws quite a bit of power and generates a great deal of heat.
--
Doug Carman
pdp11(a)bellsouth.net
all left standing in the rain before the local
scrap dealer hauled them
away. I was able to salvage some parts from the 8650 before we got rid
of it, but it would have been impossible to have ever run the system
outside a data center environment. The size, weight, massive cooling
requirements and the 3 phase, 60 amp power circuit would prevent such a
system from being a practical hobbyist computer. It's a shame to see
Correct me if I'm wrong, but I seem to recall there being people on
this list who do use such systems at home.
8:53 p.m.
That would be doubtful, but not totally impossible. It
would be
interesting to hear from anyone who has one of the large VAX-11
computers for a hobby system. Other VAX systems might be more suitable
for home use, but the 11/780 through 8650 were massive power hogs. I
still have the power plug and receptacle from one of our 8650's. People
are always amazed that it was used to power a single computer. A 60 amp
3 phase circuit is out of the range of any type of residential electric
service.
Well, considering that I know someone a few miles away with an 11/780 at
home.....
Given the chance and the room I'd get an 11/780 without a second thought.
Granted I wouldn't run it much, but I'd love to have one that I could run,
and if needed I'd put in the necessary circuit. Unfortuantly I don't have
the room right now. When my wife and I start looking for a house, one of
the main things we're going to be looking for is one where I can have a
large computer room.
What really bummed me 2-3 years ago was having to pass on a VAX-11/750
system that a guy locally had running in his garage because I didn't have a
place to put it.
Oh, and I've a decent sized PDP-11/44 spread out between my Parents garage,
and one of my storage units. Though I did have to give the TU-81+ for it
away a few months ago do to lack of room.
BTW, one of my neighbors is trying to get a VAX 6000 running in his second
floor apartment!
Zane
--
| Zane H. Healy | UNIX Systems Administrator |
| healyzh(a)aracnet.com (primary) | OpenVMS Enthusiast |
| healyzh(a)holonet.net (alternate) | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| and Zane's Computer Museum. |
| http://www.aracnet.com/~healyzh/ |
15 May
15 May
1:15 p.m.
this is not quite the same vintage as a vax, but an interersting project:
http://www.fh-wedel.de/~kl/text/sgifridge/
hmmm... i wonder what i could turn my ibm powerstation 530 into...
mark
=======================
Mark Nias
http://www.mr2.net
http://www.marknias.com
=======================
-----Original Message-----
From: owner-classiccmp(a)classiccmp.org
[mailto:owner-classiccmp@classiccmp.org]On Behalf Of Curt Vendel
Sent: 16 May 2001 00:02
To: classiccmp(a)classiccmp.org
Subject: Re: VAX bar
Before you know it there will be 3400's used as nightstands,
8000's as wardrobes
or refrigerators, 4000's used as kitchen cabinets. Heaven
forbid this becomes
"fashionable" suddenly the innocent slaughtering of vaxen's could
become rampant,
only 2nd to animal furs.... protestors will have to picket
outside of Peir 1's
and Ikea's and instead of throwing red paint, they'll throw MMJ
connectors and
cabinet assembly bolts at people buying these attrocities....
Sorry Sellam, I couldn't resist :-)
Curt
Sellam Ismail wrote:
innocent VAXen :)
------------------------------------------------------------------
------------
On Tue, 15 May 2001, Jeff Hellige wrote:
> On Tuesday, May 15, 2001, at 10:47 AM, Sellam Ismail wrote:
> > On Tue, 15 May 2001, Curt Vendel wrote:
> > >> A truly beautiful work
of insanity.... two thumbs up!
> > > A waste of a VAX :( Two
big thumbs down.
> The interior had already been
stripped of usable parts
prior to him
rescuing
the cabinet so at least it was rescued vice going to the dump
or scrapped.
I just don't want to encourage the destruction of other
Sellam Ismail Vintage
Computer Festival
International Man of Intrigue and Danger
http://www.vintage.org
3:34 p.m.
A 3400 could function as a nightstand with no loss of functionality (in
fact, it could be an especially functional white noise generator...)
My 5400 / BA215 functioned well as an aquarium stand for some gerbils and
Ultrix runs to this day. I think I have a photo of it in this role
somewhere...
On Tue, 15 May 2001, Curt Vendel wrote:
Before you know it there will be 3400's used as
nightstands, 8000's as
wardrobes or refrigerators, 4000's used as kitchen cabinets. Heaven
forbid this becomes "fashionable" suddenly the innocent slaughtering
of vaxen's could become rampant, only 2nd to animal furs....
protestors will have to picket outside of Peir 1's and Ikea's and
instead of throwing red paint, they'll throw MMJ connectors and
cabinet assembly bolts at people buying these attrocities....
4:36 p.m.
New subject: Console bulkhead battery source
I have a BA215 DECsystem 5400 whose NiCad battery pack for the TOY clock
and console settings has finally given up the ghost. It consists of three
AAA 1.2V 180mAh NiCads shrinkwrapped together leading to a Molex 2695 two
lead connector.
1) Does anyone know a source for these other than Compaq? I cringe to
think what they would charge for one.
I admit that I am something of an ignoramous regarding electronics and
read with envy when others post about finding easy fixes for blown power
supplies and the like. With this in mind:
2) does anyone know easily offhand if other 1.2V battery packs could be
used in its place? There seem to be two or four cell AAA battery packs
available on the web but would these work in this scenario without damage
to anything? I did not find any three cell packs. What are the rules of
thumb for what would or wouldn't work?
Somewhat related question just because I am curious:
3) is the console bulkhead on my 5400 the same as is used on other QBUS
DSSI Mayfair MicroVAX 3x00? Mine has a part number 70-25775-02. I guess
I would be surprised if it was different.
--
8:19 p.m.
New subject: Console bulkhead battery source
On Tue, 15 May 2001, Paul Thompson wrote:
I have a BA215 DECsystem 5400 whose NiCad battery pack for the TOY clock
and console settings has finally given up the ghost. It consists of three
AAA 1.2V 180mAh NiCads shrinkwrapped together leading to a Molex 2695 two
lead connector.
1) Does anyone know a source for these other than Compaq? I cringe to
think what they would charge for one.
I admit that I am something of an ignoramous regarding electronics and
read with envy when others post about finding easy fixes for blown power
supplies and the like. With this in mind:
2) does anyone know easily offhand if other 1.2V battery packs could be
used in its place? There seem to be two or four cell AAA battery packs
available on the web but would these work in this scenario without damage
to anything? I did not find any three cell packs. What are the rules of
thumb for what would or wouldn't work?
Get the four cell package, use your razor knife to remove the fourth
battery, resolder the lead from the fourth to the third cell and
install.
- don
Somewhat related question just because I am curious:
3) is the console bulkhead on my 5400 the same as is used on other QBUS
DSSI Mayfair MicroVAX 3x00? Mine has a part number 70-25775-02. I guess
I would be surprised if it was different.
--
16 May
16 May
4:20 a.m.
New subject: Console bulkhead battery source
Good idea.
With other battery packs I tried to use off the shelf batteries to make a
new pack but had very poor luck in getting the solder to stick to the
battery. It seemed like a spot weld was used to attach the wire rather
than normal solder.
I assume that your idea uses the existing leads in the battery pack to get
around this problem.
On Tue, 15 May 2001, Don Maslin wrote:
Get the four cell package, use your razor knife to
remove the fourth
battery, resolder the lead from the fourth to the third cell and
install.
--
9:30 a.m.
New subject: Console bulkhead battery source
On Wed, 16 May 2001, Paul Thompson wrote:
Good idea.
With other battery packs I tried to use off the shelf batteries to make a
new pack but had very poor luck in getting the solder to stick to the
battery. It seemed like a spot weld was used to attach the wire rather
than normal solder.
Certainly a spot weld is the preferable means, but I have had pretty
good success with scratching up the surface, fluxing well, and using a
large enough iron to heat that area quickly.
- don
I assume that your idea uses the existing leads in the
battery pack to get
around this problem.
On Tue, 15 May 2001, Don Maslin wrote:
Get the four cell package, use your razor knife
to remove the fourth
battery, resolder the lead from the fourth to the third cell and
install.
--
12:51 p.m.
New subject: Console bulkhead battery source
Try the Nicad Lady http://www.nicdlady.com/index.htm
She uses very fresh batteries and has an ultrasonic welder to make the packs.
9:15 a.m.
New subject: Console bulkhead battery source
Date: Wed, 16 May 2001 14:51:09 -0700
To: classiccmp(a)classiccmp.org
From: Mike Ford <mikeford(a)socal.rr.com>
Subject: Re: Console bulkhead battery source
Reply-to: classiccmp(a)classiccmp.org
Try the Nicad Lady http://www.nicdlady.com/index.htm
She uses very fresh batteries and has an ultrasonic welder to make the packs.
Excellent but a comment:
Many battery rebuilders recycles the old straps besides special
items. no no!
Cheers,
Wizard
2:10 p.m.
New subject: Console bulkhead battery source
Try the Nicad
Lady http://www.nicdlady.com/index.htm
She uses very fresh batteries and has an ultrasonic welder to make the
packs.
Excellent but a comment:
Many battery rebuilders recycles the old straps besides special
items. no no!
12:56 p.m.
New subject: Rebuilding Mac Portable batteries with caps
I've been thinking about rebuilding some Mac Portable batteries, and
instead of putting in the Cyclon or whatever leadacid cells I am planning
on just using a good sized capacitor with maybe some kind of current
limiting resistor. The goal isn't for portable use, but just to keep the DC
smooth and provide the "kick" to get the hard drive spun up. Opinions?
Marvin you still have those caps?
2:04 p.m.
New subject: Rebuilding Mac Portable batteries with caps
Whether or not you need the caps depends on what kind of power supply
you plan on running the Mac from. Generally, the lower the frequency of
the power supply, the more capacitance you'll need. In other words, a
linear supply that operates at 60 Hz will need a lot more capacitance than
a switcher suppy that operates at 24kHz. I realize that you'll use a "DC"
power supply but very few power supplies put out a pure DC and you need a
pretty pure source of DC to prevent glitches in the logic of the
Mac. That's one of the biggest reasons that switching power supplies were
developed originally. The high frequencies that they run at means that you
can filter out the hum and still have a power supply that's not the size of
a refrigerator! This is assuming that the load is steady. However a
computer isn't steady due to drives starting and stopping and the
like. Because of that, you'll need even MORE capitance! In any event, you
certainly won't be able to cram enough caps inside the Mac to adaquetely
filter it. If I were you and I wasn't concerned with portability, I would
run the Mac off of some kind of large battery, perhaps even a car battery
or a battery out of an old UPS. Of course, you'll have to find something
that is the right voltage. However most most computers that use lead acid
batteries run off of either 6 or 12 VDC so that makes it easy. FWIW I
have a couple of old Mac portables and they seem to be real power hogs.
(That's probably why they use lead acid batteries instead of NiCads.) My
small HP power supply won't run them. Even with the drives off, it will
only run them with a partially charged battery to take up some of the peak
load. It won't run at all when the batteries are dead. And forget it when
the drive kicks in!
My 2 cents worth,
Joe
At 02:56 PM 5/16/01 -0700, you wrote:
I've been thinking about rebuilding some Mac
Portable batteries, and
instead of putting in the Cyclon or whatever leadacid cells I am planning
on just using a good sized capacitor with maybe some kind of current
limiting resistor. The goal isn't for portable use, but just to keep the DC
smooth and provide the "kick" to get the hard drive spun up. Opinions?
Marvin you still have those caps?
3:22 p.m.
New subject: Rebuilding Mac Portable batteries with caps
have a couple of old Mac portables and they seem to be
real power hogs.
(That's probably why they use lead acid batteries instead of NiCads.) My
small HP power supply won't run them. Even with the drives off, it will
only run them with a partially charged battery to take up some of the peak
load. It won't run at all when the batteries are dead. And forget it when
the drive kicks in!
I have a bunch of Apple powerbook adapters, and generally if you use the
larger of the 1xx series adapters that will run the portable including
spinning up the HD, but just barely. Any battery "problems" and it won't
spin up without resetting the computer. I have 3 batteries to play with,
and at least one will hold a partial charge, but I really don't want to
fiddle with the battery every couple years.
Something to play with anyway.
2:16 p.m.
New subject: Rebuilding Mac Portable batteries with caps
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8:10 a.m.
New subject: Console bulkhead battery source
At 08:36 PM 5/15/01 -0500, Paul Thompson wrote:
I have a BA215 DECsystem 5400 whose NiCad battery pack
for the TOY clock
and console settings has finally given up the ghost. It consists of three
AAA 1.2V 180mAh NiCads shrinkwrapped together leading to a Molex 2695 two
lead connector.
Ah yes, the dead battery syndrome...
1) Does anyone know a source for these other than
Compaq? I cringe to
think what they would charge for one.
They are quite expensive as the last time I checked (about a year ago)
Compaq wanted you to buy the whole bulkhead for $175.00
I admit that I am something of an ignoramous regarding
electronics and
read with envy when others post about finding easy fixes for blown power
supplies and the like. With this in mind:
Not to worry, we're here to help.
2) does anyone know easily offhand if other 1.2V
battery packs could be
used in its place? There seem to be two or four cell AAA battery packs
available on the web but would these work in this scenario without damage
to anything? I did not find any three cell packs. What are the rules of
thumb for what would or wouldn't work?
Any similarly sized NiCd cells will work. I've heard rumors that there is a
Panasonic wireless phone pack that is the same but I've not found it. I
ordered some NiCd cells from www.digikey.com and replaced them. I should
probably sit down and do a couple dozen of these (it would be faster) and
offer them on the House of VAX site :-)
Somewhat related question just because I am curious:
3) is the console bulkhead on my 5400 the same as is used on other QBUS
DSSI Mayfair MicroVAX 3x00? Mine has a part number 70-25775-02. I guess
I would be surprised if it was different.
Actually it turns out they are different. Weird I know. The KN220 console
has a wider connector for the CPU side than the Mayfair connector. (I've
got a DECSystem 5500) I have a spare bulkhead but I don't know the state of
its battery pack.
--Chuck
9:20 a.m.
New subject: Console bulkhead battery source
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2:16 p.m.
New subject: Console bulkhead battery source
On Wed, 16 May 2001, Tony Duell wrote:
Perhaps this is not the place to mention that I was
connecting cells in
series before I ever went to school....
As good a place as any.
I have hooked batteries in series on the fly before, but usually on
circuits not sensitive to gross mistakes or ones where I was not concerned
if my meddling hosed things up. I wanted to take a little more care in
this case and go by the book.
You want to keep the capacity (180mAh in this case)
similar as well. The
charging current for the cells is normally around one tenth of the
capacity, so you'd expect a 18mA charging current in this case. You'd not
want to use cells of a very different capacity unless you also want to
modify the charging circuit (this might be trivial given the schematic,
it might not, but in any case it's easier to get the right cells).
I did some searching and could not find any 180mAh batteries, even among
vendors carrying panasonic batteries (which these were incidentally). It
seems the line has been discontinued since 1990. The available cells were
all in the 220-250mAh range. I hope this is not a wide enough variation
to make a difference, or would I just need to leave the machine on longer
to charge the cells?
Thanks everyone for all the helpful responses...Paul
3:12 p.m.
New subject: Console bulkhead battery source
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