4 Mar
1998
4 Mar
'98
4:29 p.m.
Although recent world-wide test results have proven otherwise, the
US board of education seems to think that calculators improve
students' minds (I feel that the insane amount of money that schools
put into technology these days is better spent on books and teachers).
Therefore, in our school most seniors and juniors either own or rent
a TI-8x. The TI-83 is the one that the school actually promotes, but
TI-85s are often stole...ahem....seen as well. My friend is probably
one of the few there to have a TI-92. I'll bet it could run System 1.0
with a few modifications ;)
I wonder what the odds of finding a ti-85 are and cost?
They are
hackable
from what I gather.
Allison
PS That OS I mentioned earlier is essentially Win3.1 for TI. It is a
concurrent windowing interface. Right now, he's trying to figure out the
concurrent part...
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4 Mar
4 Mar
4:38 p.m.
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9:18 p.m.
At 02:38 PM 04-03-98 -0800, Tim Shoppa wrote:
As a nuclear physicist, I find very little need for a
hand calculator.
Just about all the math I need to do falls into one of two categories:
1. Can be done on the blackboard.
2. Needs a supercomputer to solve.
Shouldn't that read "needs next year's supercomputer to solve" :-)
Personally I miss my HP25. I've still got it but the battery has died and
HP say that it's not economical to fix (ie cheaper to buy this year's model).
Huw Davies | e-mail: Huw.Davies(a)latrobe.edu.au
Information Technology Services | Phone: +61 3 9479 1550 Fax: +61 3 9479
1999
La Trobe University | "My Alfa keeps me poor in a monetary
Melbourne Australia 3083 | sense, but rich in so many other ways"
8:39 p.m.
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10:50 p.m.
At 06:39 PM 3/4/98 -0800, you wrote:
> Personally I miss my HP25. I've still got it
but the battery has died and
> HP say that it's not economical to fix (ie cheaper to buy this year's
model).
The battery pack is just two NiCad AA's welded to a set of contacts. It's
very easy to fix this on your own - if you don't have a spot-welder
in your household, solder will do after you roughen up the battery contact
surfaces. (In the past decade I've gone through
a HP15C and a HP41, but it's the HP25 that I still prefer...)
Tim.
Tim,
I have a battery spot welder and repair HP batteries (and calculators),
contact me directly if you're interested in getting it fixed.
Joe
5 Mar
5 Mar
2:11 p.m.
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4:25 p.m.
On Thu, 5 Mar 1998 20:11:39 +0000 (GMT), you said:
I've done that with my aged HP-21; cut the plastic battery pack open
and replaced the nicads. With my HP-38, the batteries were in a metal
holder and easily replaced.
_______________
Barry Peterson bmpete(a)swbell.net
Husband to Diane, Father to Doug,
Grandfather to Zoe and Tegan.
The battery
pack is just two NiCad AA's welded to a set of contacts. It's
very easy to fix this on your own - if you don't have a spot-welder
in your household, solder will do after you roughen up the battery contact
surfaces. (In the past decade I've gone through
a HP15C and a HP41, but it's the HP25 that I still prefer...)
All my HP20-series machines (woodstocks) have a metal spring in the
battery pack that presses the cells against the terminals in the
calculator. It will also connect a pair of normal AA cells together
without needing to spot-weld or solder them.
You can open up the battery pack, extract the old cells and fit some new
AA NiCds in their place. Take care to get them the right way round, of
course - at least one of my packs has the polarities moulded into the
case, though.
6 Mar
6 Mar
7:41 a.m.
At 08:11 PM 3/5/98 +0000, you wrote:
I just rebuilt two of them yesterday. Here's a few comments.
They're a lot more reliable if you put a strap across them. The
spring/battery joint gets just enough corrision to make it intermitant.
Particurly troublesome on the C models.
The battery
pack is just two NiCad AA's welded to a set of contacts. It's
very easy to fix this on your own - if you don't have a spot-welder
in your household, solder will do after you roughen up the battery contact
surfaces. (In the past decade I've gone through
a HP15C and a HP41, but it's the HP25 that I still prefer...)
All my HP20-series machines (woodstocks) have a metal spring in the
battery pack that presses the cells against the terminals in the
calculator. It will also connect a pair of normal AA cells together
without needing to spot-weld or solder them.
You can open up the battery pack, extract the old cells and fit some new
AA NiCds in their place. Take care to get them the right way round, of
course - at least one of my packs has the polarities moulded into the
case, though.
They all do. The markings are on the inside though.
Don't use normal AA primary cells. These machines are designed to run at
2.5V, and a 3V battery pack can cause damage. Yes, that is the voice of
experience.
Yeap, that's CMOS for you. Besides non-rechargeable batteries won't last
anytime at all in calcs with LED display.
Joe
Tim.
-tony
5:56 p.m.
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9804
days inactive
9806
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8 comments
6 participants
participants (6)
-
ard＠p850ug1.demon.co.uk -
bmpete＠swbell.net -
H.Davies＠latrobe.edu.au -
maxeskin＠hotmail.com -
rigdonj＠intellistar.net -
shoppa＠alph02.triumf.ca