> On Feb 13, 2019, at 2:43 AM, Fritz Mueller via cctalk
> wrote:
>
> SUCCESS!!
>
> Put the M795 out on an extender, loaded 16 in RKBAR, and had a look
> around with a logic probe. Narrowed it down to E34 (a 7430 8-input NAND).
> Pulled, socketed, replaced, and off she goes!
>
> I ca
> From: Alan Frisbie
> I am finding this entire discussion extremely fascinating! Every day I
> look forward to reading the latest twists in the plot.
:-)
> The ideas, hunches, tests, dead ends, and results are an excellent
> example of the debugging process.
Yeah, and it wa
Those of you in So. Cal. may be interested. Lots of Sun stuff:
https://gsaauctions.gov/ATTACHMENT/REGN9/91QSCI19501806/806ListingofAvailableItems.pdf
--
--Chuck
Sent from my digital computer
On 02/13/2019 01:43 AM, Fritz Mueller via cctalk wrote:
SUCCESS!!
Put the M795 out on an extender, loaded 16 in RKBAR, and had a look around
with a logic probe. Narrowed it down to E34 (a 7430 8-input NAND). Pulled,
socketed, replaced, and off she goes!
WOW! Good detective work, that
> From: Alan Frisbie
> I am finding this entire discussion extremely fascinating! Every day I
> look forward to reading the latest twists in the plot.
I forgot to mention the most amazing part of the whole story: he first
acquired the machine while he was a student (I think?) at CMU,
> Those of you in So. Cal. may be interested. Lots of Sun stuff:
>
> https://gsaauctions.gov/ATTACHMENT/REGN9/91QSCI19501806/806ListingofAva
> ilableItems.pdf
>
To clarify this is not at JPL proper in Pasadena. It is actually in Ontario:
https://gsaauctions.gov/gsaauctions/aucitsrh/?sl=91QS
On 2/13/2019 1:43 AM, Fritz Mueller via cctalk wrote:
> SUCCESS!!
>
> Put the M795 out on an extender, loaded 16 in RKBAR, and had a look
> around with a logic probe. Narrowed it down to E34 (a 7430 8-input NAND).
> Pulled, socketed, replaced, and off she goes!
>
> I can now successfull
> On Feb 13, 2019, at 1:20 PM, Jay Jaeger via cctalk
> wrote:
>
> ...
> Maybe that story about FE's using Unix as a test to confirm operation
> even when diagnostics said the machine was OK was not so much just a
> legend?
It still fels like a legend. My experience with DEC field service eng
On Wed, Feb 13, 2019 at 2:43 AM Fritz Mueller via cctalk
wrote:
>
> SUCCESS!!
Outstanding!
> Put the M795 out on an extender, loaded 16 in RKBAR, and had a look
> around with a logic probe. Narrowed it down to E34 (a 7430 8-input NAND).
> Pulled, socketed, replaced, and off she goes!
>
>
> On Feb 13, 2019, at 3:54 PM, Ethan Dicks via cctalk
> wrote:
>
> ...
> It's interesting that it was a bad 7430 in yours. I find that for
> equipment of that vintage, my usual suspects are failed 7474s and
> failed 7440s, probably 80% of the total. Behind that, it goes 7420s
> and then may
Does anyone have documentation stashed away for the Intel PC-BUBBLE Card? The
PC-BUBBLE is an 8-bit ISA card that Intel produced for prototyping bubble
memory applications in the mid-1980s, the ROM on mine is v3.0 and says it’s
copyright 1986.
I don’t want to insert this into a system until I’m
> On Feb 13, 2019, at 3:03 PM, Paul Koning wrote:
>
> ...
> My suspicion is that things not solved by diagnostics would be escalated to
> the "wizard from Maynard". And they'd probably start replacing whole
> subsystems.
This says that Fritz actually was a new "Wizard from Maynard" in sol
On 2/13/19 1:43 AM, Fritz Mueller via cctalk wrote:
SUCCESS!!
Put the M795 out on an extender, loaded 16 in RKBAR, and had a look around
with a logic probe. Narrowed it down to E34 (a 7430 8-input NAND). Pulled,
socketed, replaced, and off she goes!
I can now successfully boot and run b
On 02/13/2019 10:40 AM, Noel Chiappa via cctalk wrote:
He's also had to do a tremendous amount of work on it to get it running,
starting with building an entire new power harness.
Yes, the 5V power harness between the regulators and the
backplane were a real mess on the 11/45 we got second hand.
On 2/13/19 5:20 PM, Jerry Weiss wrote:
I am trying to understand how the diagnostics didn't reveal this
defect. I see in the source for the diagnostic DZRKH-F there are tests
for address in the 28K-32K range and also for the 32K boundary.
So, to catch this defect the diagnostic would have to
[oops, accidentally replied directly instead of to the list]
On 2/13/19 12:54 PM, Ethan Dicks wrote:
> It's interesting that it was a bad 7430 in [your RK11-C]. I find that for
> equipment of that vintage, my usual suspects are failed 7474s and failed
> 7440s, probably 80% of the total. Behind
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