Good eye! That's Bob indeed.
Marc
From: cctalk on behalf of
"cctalk@classiccmp.org"
Reply-To: dwight , "cctalk@classiccmp.org"
Date: Friday, June 23, 2017 at 2:45 PM
To: Connor Krukosky , "cctalk@classiccmp.org"
Subject: Re: Free HP 9836 in Santa Cruz, CA
Sounds like Bob Rosenbloom.
> -Original Message-
> From: Ian S. King [mailto:isk...@uw.edu]
> Sent: 25 June 2017 01:07
> To: r...@jarratt.me.uk; Rob Jarratt ; General
> Discussion: On-Topic and Off-Topic Posts
> Subject: Re: DECstation 220 - Out of Ideas?
>
> Rob
> I don't recall from this thread - do you have pri
> Thanks Ian. Unfortunately I don't know of any schematics. I suspect you are
> right about it being a wire-OR because the documentation for the P82C206 says
> its output is tri-state. As everything is soldered on rather than socketed
> (except
> the ROMs) I am not sure I can measure any current
On 2017-06-23 14:55, Connor Krukosky via cctalk wrote:
I am in no way affiliated and wish it wasn't on the other side of the
country so I could get it!
https://sfbay.craigslist.org/scz/sys/6188389886.html
"I have a single monochrome HP 9836 computer with two monitors and three
printers left.
Al
On 25/06/2017 11:46, Rob Jarratt via cctalk wrote:
I have done a bit more tracing of components and have come across a
possibly anomaly. The signal that won't go low enough goes to the
input (pin 2) of a 74LS125 buffer.
As soon as I saw "74LS125" I thought, "Oh, yes, another one". That's a
f
> -Original Message-
> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Pete
> Turnbull via cctalk
> Sent: 25 June 2017 16:12
> To: cctalk@classiccmp.org
> Subject: Re: DECstation 220 - Out of Ideas?
>
> As soon as I saw "74LS125" I thought, "Oh, yes, another one". That'
> From: Al Kossow
Hey, thanks for all the effort to help...
> which has the schematic
> they have been there for over three years
$@#&($^@(*$&^! That's what I get for trusting Google; I tried searching
for '"DB11-A" prints' and '"DB11-A" drawings' and got nothing ... except for
a
On 06/25/2017 09:24 AM, Rob Jarratt via cctalk wrote:
> Thanks Pete, so there is enough of a chance that I have found the
> culprit to make it worth the effort of desoldering it.
>
> I have been wondering for a while about getting a hot air rework
> station. There are lots of cheap Chinese ones o
> When replacing components on an SMD board, I prefer to use a low-temp
> fusible alloy such as "Chip Quik":
>
> http://www.chipquik.com/store/
>
> A nice kit, but really, any low temp fusible alloy will work. I use
> Cerrobend as a
> powder, packed around the IC.
>
> http://www.csalloys.com/s
On 06/25/2017 11:41 AM, Rob Jarratt wrote:
> Thanks Chuck, I had seen some mention of Chip Quik. You say soldering a new
> part is straightforward, but I am not clear how that works, is the solder
> left behind on the pads so you just heat the pins?
As mentioned, I use the toothbrush to scrub t
Rob,
I have a cheap hot air re-work station that you are welcome to borrow. You
might need to order a nozzle as I do,t have many
Dave
> -Original Message-
> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Rob Jarratt
> via cctalk
> Sent: 25 June 2017 11:47
> To: 'Genera
Heheh, that's a cool idea. I use a post-it note, sliding a non-sticky side
under the pins (from the rear of said pins) as I drag the iron across all
the pins.
=]
On Sun, Jun 25, 2017 at 11:27 AM Pete Turnbull via cctalk <
cctalk@classiccmp.org> wrote:
> On 25/06/2017 11:46, Rob Jarratt via cctal
wow impressive work Brad! Thanks for blogging about it, it's fun to
watch you progress. Ever consider selling some of the PCB boards, and
coming up with a BOM list, so we can recreate some too?
> -Original Message-
> From: Dave Wade [mailto:dave.g4...@gmail.com]
> Sent: 25 June 2017 20:26
> To: r...@jarratt.me.uk; 'Rob Jarratt' ; 'General
> Discussion: On-Topic and Off-Topic Posts'
> Subject: RE: DECstation 220 - Out of Ideas?
>
> Rob,
> I have a cheap hot air re-work station
Well, at least it was DEC who messed up and not me (this time).
Noel, thanks for scanning.
Al, thanks for figuring it out.
Paul
On Sat, Jun 24, 2017 at 11:50 AM, Al Kossow via cctalk <
cctalk@classiccmp.org> wrote:
> They screwed up when they made the maint prints, it's missing from ours as
>
On 25/06/2017 11:46, Rob Jarratt via cctalk wrote:
I have done a bit more tracing of components and have come across a
possibly anomaly. The signal that won't go low enough goes to the
input (pin 2) of a 74LS125 buffer.
OK, for SOIC parts, here's my technique. (I've had to
replace quite a
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