2016-09-07 17:33 GMT+02:00 Doug Ingraham :
> The most likely cause of what you are seeing is a broken wire when the
> plane was originally assembled. The wire was pulled back a few cores and
> the end stripped. New wire was soldered to old, insulated and then they
>
The most likely cause of what you are seeing is a broken wire when the
plane was originally assembled. The wire was pulled back a few cores and
the end stripped. New wire was soldered to old, insulated and then they
continued threading in that wire. Over the years the solder joint has
degraded
So what are the other options?
* Trying to repair the unit. Every plane is soldered together with the ones
nearby to convey the X/Y signals. This can probably be undone with a
patience and soldering braid. But what are the chance that the X/Y wires
gets lose then? Are those soldered or welded
From: "Mattis Lind: Tuesday, September 06, 2016 2:11 AM
* Use a PDP-15 MM15 stack and sense/inhibit boards.
I have several off these. Adding a small backplane, put the X/Y drivers,
sense amp/inhibit drivers and level converters there and then adapt to the
existing slots for the memory module.
>
> I'd tend to be more pessimistic about this working.
>
> There are different requirements in winding a wire for purposes of inhibit
> and sense.
> In the 3-wire arrangement the winding of the combined wire has to meet both
> sets of requirements.
>
> Specifically, for this case, in a 4-wire
On 09/05/2016 09:28 PM, Brent Hilpert wrote:
I'd tend to be more pessimistic about this working.
In the 3-wire example there you can see how the S/I wire was split in half with
a special resistor network at one end to allow inhibit current flow
while at the same time configuring it as a
On 2016-Sep-05, at 4:36 PM, Jon Elson wrote:
> On 09/05/2016 05:46 PM, Mattis Lind wrote:
>> måndag 5 september 2016 skrev Jon Elson :
>>
>>> On 09/05/2016 01:59 PM, Mattis Lind wrote:
>>>
I have now concluded that the fault is in the core memory module itself.
On 09/05/2016 05:46 PM, Mattis Lind wrote:
måndag 5 september 2016 skrev Jon Elson :
On 09/05/2016 01:59 PM, Mattis Lind wrote:
I have now concluded that the fault is in the core memory module itself.
The sense winding is broken on bit plane 7.
Have you actually
måndag 5 september 2016 skrev Jon Elson :
> On 09/05/2016 01:59 PM, Mattis Lind wrote:
>
>>
>> I have now concluded that the fault is in the core memory module itself.
>> The sense winding is broken on bit plane 7.
>>
>>
>> Have you actually ohmed out the sense/inhibit
måndag 5 september 2016 skrev Jon Elson :
> On 09/05/2016 01:59 PM, Mattis Lind wrote:
>
>>
>> I have now concluded that the fault is in the core memory module itself.
>> The sense winding is broken on bit plane 7.
>>
>>
>> Have you actually ohmed out the sense/inhibit
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