SOME of the later S100 systems had regulated supplies and then ditched the
board regulators, usually leaving a place to put a regulator with just a jumper
wire in place of the regulator.
tony duell a...@p850ug1.demon.co.uk wrote:
... Which also may well not be RML original. The 380Z has a
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Adrian
Graham
Sent: 01 August 2015 10:10
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: RM 380Z Special Control Unit (?)
On 01/08/2015 05:38, tony duell
On 07/31/2015 11:38 PM, tony duell wrote:
As Jules and Tony have said, that's not 380Z internals so if that puts you
off I'll have a punt just for the power supply ;)
... Which also may well not be RML original. The 380Z has a regulated PSU,
S100 has separate regulators on each board and an
Always interested in a 2000 and a 4000. I suspect these were destined for
other people, but if the takers have not materialised then I will happily
take them.
Regards
Rob
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Adrian
Graham
Sent: 01
On Aug 1, 2015, at 3:24 PM, Robert Jarratt robert.jarr...@ntlworld.com
wrote:
Thanks for the suggestion, but Hakko appears not to be available in the UK.
On ebay I can find US sellers and Chinese sellers. I suspect the Chinese ones
are imitations, so I would prefer to avoid those.
Sorry
On 2015-Aug-01, at 2:38 PM, Paul Koning wrote:
On Aug 1, 2015, at 5:24 PM, Robert Jarratt robert.jarr...@ntlworld.com
wrote:
PS A related question. I struggled somewhat with the Weller Magnastat No. 8
tip, when trying to solder leads to the ground plane, I could not get the
solder to stay
On 08/01/2015 04:24 PM, Robert Jarratt wrote:
Today I was able to repair the LCD monitor (admittedly a cheap one) on my
son's computer by replacing some of the electrolytic capacitors.
I repaired an LCD monitor that they were going to trash at
work. You had to massively disassemble it to
Hi all!
I recently acquired a SPARCclassic, which is my first bit of Sun hardware.
Having an awful time getting it to boot from the CD-ROM. I have tried a bunch
of different terminators and several different cables, but whenever I try to
boot I get this:
ok boot cdrom -s
Boot device:
On Aug 1, 2015, at 21:22 , drlegendre . drlegen...@gmail.com wrote:
That's an old joke. Some (newb) asks How do you switch it on, i want to
play Spacewar (or whatever), cagey user says You put a dollar in one of
these slots... ;-)
I guarantee it.
That's my number one theory, followed by
I found a dollar bill inside an Apple Monitor II. It appeared to have been
folded into quarters and then pushed through one of the cooling slots on top of
the monitor. The monitor and matching IIe computer look like they came from a
school based on the property numbers engraved onto them. I've
On Sat, Aug 1, 2015 at 2:36 PM, Brent Hilpert hilp...@cs.ubc.ca wrote:
Just a suggestion: you're sure there no ground reference problem on pin 7
(V-) of the 723? (hence raising the Vref).
I've seen small 723-based supplies with sense leads where the 723 V- is on
the neg. sense lead rather
On Aug 1, 2015, at 2:24 PM, Robert Jarratt robert.jarr...@ntlworld.com
wrote:
PS A related question. I struggled somewhat with the Weller Magnastat No. 8
tip, when trying to solder leads to the ground plane, I could not get the
solder to stay molten very long. I was using lead-free solder,
On Aug 1, 2015, at 6:36 PM, TeoZ t...@neo.rr.com wrote:
I still use a bunch of lead solder I purchased to fix the RAM on a C64 back
in the late 1980's plus you can still get it from China on ebay super cheap.
Fortunately, real solder is still readily available; my current tools catalog
On Aug 1, 2015, at 6:49 PM, Brent Hilpert hilp...@cs.ubc.ca wrote:
...
As an example, I was trying to solder on the ground-plane of a 1970s (i.e.
leaded everything) Heath digital tuner recently (double-sided ground plane on
the PCB).
Old Weller 48W/700F/mag-temp-switch iron was not up
On 08/01/2015 03:24 PM, Robert Jarratt wrote:
PS A related question. I struggled somewhat with the Weller Magnastat
No. 8 tip, when trying to solder leads to the ground plane, I could
not get the solder to stay molten very long. I was using lead-free
solder, its melting point is much lower than
On Saturday (08/01/2015 at 07:05PM -0400), Vlad Stamate wrote:
I was pleasantly impressed that the
drive head has not been damaged bumping in the leather piece all the
time. I am not sure how that got there, I assume a child pushed it in
by mistake?
Peter!
On Sat, 1 Aug 2015, drlegendre . wrote:
On Sat, Aug 1, 2015 at 6:05 PM, Vlad Stamate vlad.stam...@gmail.com wrote:
I recently got a very nice HP 9816 with a 9121 drive unit from Earl
Baugh (thanks Earl!). The computer worked fine but the primary drive of
the 9121 refused to read the disk and
On Fri, Jul 31, 2015 at 06:43:44PM +0100, Robert Jarratt wrote:
From the slides you posted it looks like you have some kind of automated set
up. Can you explain what you have there?
The only automation was the data collection. For the reforming I set the
lab supply to the current limit I think
There we two different reference voltages on 723s. I don't recall which
was which but one had to change the feedback resistors if you used the
wrong one.
If seems there is only one ref voltage available today.
I think Jameco carries them. What package do you need. They
cam in cans and dips.
On Sat, 1 Aug 2015, Robert Jarratt wrote:
PS A related question. I struggled somewhat with the Weller Magnastat
No. 8 tip, when trying to solder leads to the ground plane, I could not
get the solder to stay molten very long. I was using lead-free solder,
its melting point is much lower than
What is that item?
Looks like a piece of laced (p)leather-craft from a children's summer camp
project..
On Sat, Aug 1, 2015 at 6:05 PM, Vlad Stamate vlad.stam...@gmail.com wrote:
Hi,
I recently got a very nice HP 9816 with a 9121 drive unit from Earl
Baugh (thanks Earl!). The computer
The root cause of the failure appears to be that the internal voltage
reference of the uA723, which is specified as 7.15V ±0.35V, is now
9.4V. The uA723 needs to be replaced. The uA723 is still readily
That's an unsual failure. I've had 723s go internally short-circuit and
then the output
At 05:24 PM 8/1/2015, Robert Jarratt wrote:
I suppose I now have at least some justification in the eyes of She Who Must
Be Obeyed for continuing with this hobby
One of the few benefits enjoyed by those of us who do not have a Hilda is that
we have no interference with our hobbies. :-)
Dale
On Sat, Aug 1, 2015 at 5:52 PM, dwight dkel...@hotmail.com wrote:
There we two different reference voltages on 723s. I don't recall which
was which but one had to change the feedback resistors if you used the
wrong one.
There's a reference with a built-in current source and amplifier,
which
On Aug 1, 2015, at 8:28 PM, Chuck Guzis ccl...@sydex.com wrote:
...
I never use RoHS solder--it simply doesn't wet or flow like 67/37 Sn/Pb
solder. The exception is SMT where components are mounted using solder paste
(powered solder+flux). If I could find some of the leaded stuff, I'd
SOME of the later S100 systems had regulated supplies and then ditched the
board regulators,
usually leaving a place to put a regulator with just a jumper wire in place
of the regulator.
Sure. But in this machine I can see some heatsinks on the S100 boards that are
likely to
be used for
On Aug 1, 2015, at 5:24 PM, Robert Jarratt robert.jarr...@ntlworld.com
wrote:
PS A related question. I struggled somewhat with the Weller Magnastat No. 8
tip, when trying to solder leads to the ground plane, I could not get the
solder to stay molten very long. I was using lead-free
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Paul Koning
Sent: 01 August 2015 22:39
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: This Hobby Is Actually Useful!
On Aug 1, 2015, at 5:24 PM, Robert Jarratt
I still use a bunch of lead solder I purchased to fix the RAM on a C64 back
in the late 1980's plus you can still get it from China on ebay super cheap.
Just this week I fixed an Apple Ibook G3-500 that had the connector for the
trackpad/mouse come off the board from bad lead free soldering at
Hi,
I recently got a very nice HP 9816 with a 9121 drive unit from Earl
Baugh (thanks Earl!). The computer worked fine but the primary drive
of the 9121 refused to read the disk and made a continuous beating
noise. After I cleaned it on the outside I opened it to see what is
wrong with it. And I
On Sat, 1 Aug 2015, drlegendre . wrote:
What is that item?
Looks like a piece of laced (p)leather-craft from a children's summer camp
project..
an improvised floppy drive shipping head protector?
On Sat, Aug 1, 2015 at 2:14 PM, tony duell a...@p850ug1.demon.co.uk wrote:
The root cause of the failure appears to be that the internal voltage
reference of the uA723, which is specified as 7.15V ±0.35V, is now
9.4V. The uA723 needs to be replaced. The uA723 is still readily
That's an unsual
Today I was able to repair the LCD monitor (admittedly a cheap one) on my
son's computer by replacing some of the electrolytic capacitors.
Had I not got into collecting and restoring (sometimes) old DEC machines, I
would not have had the ESR meter, the de-soldering and soldering equipment,
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Ian
McLaughlin
Sent: 01 August 2015 22:44
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: This Hobby Is Actually Useful!
On Aug 1, 2015, at 2:24 PM, Robert Jarratt
What other strange pieces did you find when you opened up classic computers?
A TRS80 model 1 where some keys had stopped working due to an accumulation
of marijuana seeds
On Sat, 1 Aug 2015, Vlad Stamate wrote:
Hi,
I recently got a very nice HP 9816 with a 9121 drive unit from Earl
Baugh (thanks Earl!). The computer worked fine but the primary drive of
the 9121 refused to read the disk and made a continuous beating noise.
After I cleaned it on the outside I
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Ian
McLaughlin
Sent: 01 August 2015 23:39
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: This Hobby Is Actually Useful!
On Aug 1, 2015, at 3:24 PM, Robert Jarratt
On Sat, Aug 01, 2015, Vlad Stamate wrote:
Hi,
I recently got a very nice HP 9816 with a 9121 drive unit from Earl
Baugh (thanks Earl!). The computer worked fine but the primary drive
of the 9121 refused to read the disk and made a continuous beating
noise. After I cleaned it on the outside
On Sat, Aug 1, 2015 at 5:37 PM, Fred Cisin ci...@xenosoft.com wrote:
What other strange pieces did you find when you opened up classic
computers?
A TRS80 model 1 where some keys had stopped working due to an accumulation
of marijuana seeds
Someone was using it wrong. No seeds or stems!
On 01/08/2015 05:38, tony duell a...@p850ug1.demon.co.uk wrote:
As Jules and Tony have said, that's not 380Z internals so if that puts you
off I'll have a punt just for the power supply ;)
... Which also may well not be RML original. The 380Z has a regulated PSU,
S100 has separate
Folks,
Before the great company meltdown of Jan this year and as I discovered the
great mailing list breakdown of not long after I saved some DEC kit for list
members to collect, namely:
Alpha 800 (rackmount)
uVAX 2000
VAX 4000VLC
These are still in my hallway in Cambs UK so if either the
Hi, I would be very interested in the 4000 vlc. Is it still available? Also is
shipping to Germany possible? How miuch would it cost?
Bye,
Lukas Kaminski
Sent from my BlackBerry 10 smartphone.
Original Message
From: Adrian Graham
Sent: Saturday, August 1, 2015 12:11
To: Discussion:
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