>>> On Tue, Feb 8, 2022 at 6:18 PM Rod Smallwood wrote:
>>> On the M8266 CPU control board a defective 7404 (E111) has killed a
>>> bunch of the PROMs holding the microcode.
That's pretty astonishing; I've heard of PROMs dropping bits over time, but
I'm a bit amazed to hear of a failu
On 2/8/22 15:49, Paul Koning via cctalk wrote:
The maintenance manual (on Bitsavers) speaks of a "read/write head" and has an
illustration that shows one of the head elements with a "read/write coil". So the
implication is that (a) there isn't an erase head, and (b) the same head serves for
I am in the process or restoring a TU56 so it's in pieces. Pictures of
the head were requested so here they are.
These were taken with my phone so the quality is only mediocre.
This, like the rest of the drive, is in the process of being restored.
I'm still not sure how to clean the front of
> On Feb 9, 2022, at 11:11 AM, Mike Katz via cctalk
> wrote:
>
> I am in the process or restoring a TU56 so it's in pieces. Pictures of the
> head were requested so here they are.
>
> These were taken with my phone so the quality is only mediocre.
>
> This, like the rest of the drive, is
What about corrosion or calcification or whatever that crusty stuff is
on the heads.
I used 3M Scotchbrite to clean the sides.
On 2/9/2022 11:23 AM, Paul Koning wrote:
On Feb 9, 2022, at 11:11 AM, Mike Katz via cctalk wrote:
I am in the process or restoring a TU56 so it's in pieces. Pictu
Hi
Thank you all for your kind and quick replies.
I am sure somebody will come up with the actual images either the
original files or derived from what we have.
As the key to the function of the 11/34 CPU their addition to the body
of informatio they will be of imense benefit to us all.
R
>
>
> Date: Tue, 8 Feb 2022 20:55:31 +
> From: Wayne S
> Subject: Re: DECTape head problem
>
> So it serms dectape heads are special. I don?t think Dec would have the
> desire to make them internally so they probably contractef with a company
> already set up to do that. Who were the big tape
On 2/9/22 10:54, Michael Thompson via cctech wrote:
Date: Tue, 8 Feb 2022 20:55:31 +
From: Wayne S
Subject: Re: DECTape head problem
So it serms dectape heads are special. I don?t think Dec would have the
desire to make them internally so they probably contractef with a company
already set
On Wed, Feb 9, 2022 at 10:11 AM Mike Katz via cctalk
wrote:
> I'm still not sure how to clean the front of the head where the tape
> touches the head. Any ideas?
Back in the day there was "Tape Head Cleaner" Which was a little tin
of trichlorotrifluoroethane (a.k.a. Freon 113) where you screwed
On 2/9/22 12:44, Gavin Scott via cctalk wrote:
> On Wed, Feb 9, 2022 at 10:11 AM Mike Katz via cctalk
> wrote:
>> I'm still not sure how to clean the front of the head where the tape
>> touches the head. Any ideas?
>
> Back in the day there was "Tape Head Cleaner" Which was a little tin
> of tri
Thank you.
On 2/9/2022 3:46 PM, Chuck Guzis via cctalk wrote:
On 2/9/22 12:44, Gavin Scott via cctalk wrote:
On Wed, Feb 9, 2022 at 10:11 AM Mike Katz via cctalk
wrote:
I'm still not sure how to clean the front of the head where the tape
touches the head. Any ideas?
Back in the day there wa
>>> On Tue, Feb 8, 2022 at 7:04 PM Warner Losh wrote:
>
>>> I found
>>> https://deramp.com/downloads/mfe_archive/011-Digital%20Equipment%20Corporation/08%20PDP-11/01%20PDP-1104-1134/05%20PDP-1104-1134%20Microcode/
>>> which has the source code...
>>>
>>> But I couldn't find the tools to use thes
Hi
We have narrowed the problem down.
Its the instruction decode ROM's that are the issue.
The images of those are whats needed.
Regards Rod
On 09/02/2022 23:14, Sytse van Slooten via cctalk wrote:
On Tue, Feb 8, 2022 at 7:04 PM Warner Losh wrote:
I found
https://deramp.com/downloads/m
On Wed, Feb 9, 2022, 5:16 PM Rod Smallwood via cctalk
wrote:
> Hi
>
> We have narrowed the problem down.
>
> Its the instruction decode ROM's that are the issue.
>
> The images of those are whats needed.
>
Do those chips have ROM numbers on them? 23-x is the usual format...
Warner
Reg
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