25 Apr
2021
25 Apr
'21
1:42 p.m.
Hi all --
In addition to the 11/45 project I'm also working on restoring an RF08/RS08
fixed head disk/controller (in the vain hopes of one day running TSS/8 on
my PDP-8/I). I have the power supply repaired and running and I'm getting
ready to power the logic up (the disc itself will be a project all its own,
once it arrives).
I'd like to double-check that all the flip chips are in their right places;
I have no cause to think they've been shuffled around but I want to be
sure. The engineering docs have detailed schematics but no placement chart
for the modules themselves. Given enough time with the schematics I could
derive this chart but I'm saving that as a last resort. So, two
possibilities here:
1) Does anyone know of a document I've overlooked that includes module
placement?
2) Can someone with an RF08 and/or RS08 take a few detailed pictures of the
logic (from the handle side, of course) so I can compare? (Note: the
available RF08/RS08 pictures on the 'net are of the unit currently in my
possession, so are not useful in this regard!)
Thanks!
- Josh
25 Apr
25 Apr
1:55 p.m.
Den s?n 25 apr. 2021 kl 22:43 skrev Josh Dersch via cctalk <
cctalk at classiccmp.org>:
Hi all --
In addition to the 11/45 project I'm also working on restoring an RF08/RS08
fixed head disk/controller (in the vain hopes of one day running TSS/8 on
my PDP-8/I). I have the power supply repaired and running and I'm getting
ready to power the logic up (the disc itself will be a project all its own,
once it arrives).
I'd like to double-check that all the flip chips are in their right places;
I have no cause to think they've been shuffled around but I want to be
sure. The engineering docs have detailed schematics but no placement chart
for the modules themselves. Given enough time with the schematics I could
derive this chart but I'm saving that as a last resort. So, two
possibilities here:
1) Does anyone know of a document I've overlooked that includes module
placement?
2) Can someone with an RF08 and/or RS08 take a few detailed pictures of the
logic (from the handle side, of course) so I can compare? (Note: the
available RF08/RS08 pictures on the 'net are of the unit currently in my
possession, so are not useful in this regard!)
I have a RF08 / RS08 combo. It was connected to a PDP-8/L, but the cabinet
with the DW08 was missing.
I can take a bunch of pictures next weekend.
I have a vague idea that I have a bunch of docs with the unit. Double
ledger size or around A2. I will have a look.
Would be very interesting to read your story when repairing it!
/Mattis
Thanks!
- Josh
2:40 p.m.
On Sun, Apr 25, 2021 at 1:55 PM Mattis Lind <mattislind at gmail.com> wrote:
Den s?n 25 apr. 2021 kl 22:43 skrev Josh Dersch via cctalk <
cctalk at classiccmp.org>:
Thanks! That will be very helpful!
Hi all --
In addition to the 11/45 project I'm also working on restoring an
RF08/RS08
fixed head disk/controller (in the vain hopes of one day running TSS/8 on
my PDP-8/I). I have the power supply repaired and running and I'm getting
ready to power the logic up (the disc itself will be a project all its
own,
once it arrives).
I'd like to double-check that all the flip chips are in their right
places;
I have no cause to think they've been shuffled around but I want to be
sure. The engineering docs have detailed schematics but no placement
chart
for the modules themselves. Given enough time with the schematics I could
derive this chart but I'm saving that as a last resort. So, two
possibilities here:
1) Does anyone know of a document I've overlooked that includes module
placement?
2) Can someone with an RF08 and/or RS08 take a few detailed pictures of
the
logic (from the handle side, of course) so I can compare? (Note: the
available RF08/RS08 pictures on the 'net are of the unit currently in my
possession, so are not useful in this regard!)
I have a RF08 / RS08 combo. It was connected to a PDP-8/L, but the cabinet
with the DW08 was missing.
I can take a bunch of pictures next weekend.
I have a vague idea that I have a bunch of docs with the unit. Double
ledger size or around A2. I will have a look.
Would be very interesting to read your story when
repairing it!
I'm going to try to write about it, we'll see how good I am about keeping
up. Still slowly writing things up about the 11/70 from earlier this year
and I'm behind on just about everything. I imagine getting an actual
physical disk working is going to be an unlikely prospect, my plan is to
develop some hardware to emulate one or more RS08 drives, eventually. But
I want to try the real thing first :).
- Josh
/Mattis
Thanks!
- Josh
30 Apr
30 Apr
1:19 p.m.
Here is a link of some photos I took some hurry during the evening.
https://imgur.com/a/zN3tZAV
Does it make any sense to you? There were same cables that was obscuring
the view which were hard to get out of the way. Please tell me if you can
make any sense out of it.
A quick check of the drawings didn?t reveal any module placement drawing. I
will check in more detail tomorrow.
/Mattis
s?ndag 25 april 2021 skrev Josh Dersch <derschjo at gmail.com>:
On Sun, Apr 25, 2021 at 1:55 PM Mattis Lind <mattislind at gmail.com> wrote:
Den s?n 25 apr. 2021 kl 22:43 skrev Josh Dersch via cctalk <
cctalk at classiccmp.org>:
Thanks! That will be very helpful!
Hi all --
In addition to the 11/45 project I'm also working on restoring an
RF08/RS08
fixed head disk/controller (in the vain hopes of one day running TSS/8 on
my PDP-8/I). I have the power supply repaired and running and I'm
getting
ready to power the logic up (the disc itself will be a project all its
own,
once it arrives).
I'd like to double-check that all the flip chips are in their right
places;
I have no cause to think they've been shuffled around but I want to be
sure. The engineering docs have detailed schematics but no placement
chart
for the modules themselves. Given enough time with the schematics I
could
derive this chart but I'm saving that as a last resort. So, two
possibilities here:
1) Does anyone know of a document I've overlooked that includes module
placement?
2) Can someone with an RF08 and/or RS08 take a few detailed pictures of
the
logic (from the handle side, of course) so I can compare? (Note: the
available RF08/RS08 pictures on the 'net are of the unit currently in my
possession, so are not useful in this regard!)
I have a RF08 / RS08 combo. It was connected to a PDP-8/L, but the
cabinet with the DW08 was missing.
I can take a bunch of pictures next weekend.
I have a vague idea that I have a bunch of docs with the unit. Double
ledger size or around A2. I will have a look.
Would be very interesting to read your story when
repairing it!
I'm going to try to write about it, we'll see how good I am about keeping
up. Still slowly writing things up about the 11/70 from earlier this year
and I'm behind on just about everything. I imagine getting an actual
physical disk working is going to be an unlikely prospect, my plan is to
develop some hardware to emulate one or more RS08 drives, eventually. But
I want to try the real thing first :).
- Josh
>
> /Mattis
>
>
>
>> Thanks!
>> - Josh
>>
>
2:24 p.m.
I did another check of the drawings and found a module list.
Initially I was looking for something more graphic then I found this:
https://imgur.com/a/hzmhwQ4
Hope it helps.
/Mattis
s?ndag 25 april 2021 skrev Josh Dersch <derschjo at gmail.com>:
On Sun, Apr 25, 2021 at 1:55 PM Mattis Lind <mattislind at gmail.com> wrote:
Den s?n 25 apr. 2021 kl 22:43 skrev Josh Dersch via cctalk <
cctalk at classiccmp.org>:
Thanks! That will be very helpful!
Hi all --
In addition to the 11/45 project I'm also working on restoring an
RF08/RS08
fixed head disk/controller (in the vain hopes of one day running TSS/8 on
my PDP-8/I). I have the power supply repaired and running and I'm
getting
ready to power the logic up (the disc itself will be a project all its
own,
once it arrives).
I'd like to double-check that all the flip chips are in their right
places;
I have no cause to think they've been shuffled around but I want to be
sure. The engineering docs have detailed schematics but no placement
chart
for the modules themselves. Given enough time with the schematics I
could
derive this chart but I'm saving that as a last resort. So, two
possibilities here:
1) Does anyone know of a document I've overlooked that includes module
placement?
2) Can someone with an RF08 and/or RS08 take a few detailed pictures of
the
logic (from the handle side, of course) so I can compare? (Note: the
available RF08/RS08 pictures on the 'net are of the unit currently in my
possession, so are not useful in this regard!)
I have a RF08 / RS08 combo. It was connected to a PDP-8/L, but the
cabinet with the DW08 was missing.
I can take a bunch of pictures next weekend.
I have a vague idea that I have a bunch of docs with the unit. Double
ledger size or around A2. I will have a look.
Would be very interesting to read your story when
repairing it!
I'm going to try to write about it, we'll see how good I am about keeping
up. Still slowly writing things up about the 11/70 from earlier this year
and I'm behind on just about everything. I imagine getting an actual
physical disk working is going to be an unlikely prospect, my plan is to
develop some hardware to emulate one or more RS08 drives, eventually. But
I want to try the real thing first :).
- Josh
>
> /Mattis
>
>
>
>> Thanks!
>> - Josh
>>
>
2:39 p.m.
On Fri, Apr 30, 2021 at 2:24 PM Mattis Lind <mattislind at gmail.com> wrote:
I did another check of the drawings and found a module
list.
Initially I was looking for something more graphic then I found this:
https://imgur.com/a/hzmhwQ4
Hope it helps.
/Mattis
Thanks so much, both for the pictures of your RF/RS08 and of the
engineering drawings, those will be extremely helpful. I've never seen
those drawings before, the module list you have is definitely not in the
ones available on Bitsavers.
- Josh
1 May
1 May
5:58 a.m.
Hello again.
Took pictures of the entire RF08/RS08 drawing in daylight:
https://drive.google.com/drive/folders/1-CD1D6Aok_OSpXzk0GaJhjwad0HreDhc
The paper size is rather big. I think 22 x 17 inch. I don?t have access to
such a big scanner unfortunately. Companies that do scanning charge around
two or three dollar per page here in Sweden. At least it is what I found
when checking quickly. Unless someone has access to a bigger scanner in the
Stockholm area i think this is the best I can do for now.
When looking at the schematics it quite interesting to see that DEC changed
logic symbols from what they used in the PDP-8 and PDP-9 schematics while
still using the older transistor modules rather than TTL in the RF08/RS08.
The schematics are dated around 1970.
/Mattis
fredag 30 april 2021 skrev Josh Dersch <derschjo at gmail.com>:
On Fri, Apr 30, 2021 at 2:24 PM Mattis Lind <mattislind at gmail.com> wrote:
I did another check of the drawings and found a
module list.
Initially I was looking for something more graphic then I found this:
https://imgur.com/a/hzmhwQ4
Hope it helps.
/Mattis
Thanks so much, both for the pictures of your RF/RS08 and of the
engineering drawings, those will be extremely helpful. I've never seen
those drawings before, the module list you have is definitely not in the
ones available on Bitsavers.
- Josh
26 Apr
26 Apr
6:27 a.m.
On 4/25/2021 3:55 PM, Mattis Lind via cctalk wrote:
Den s?n 25 apr. 2021 kl 22:43 skrev Josh Dersch via
cctalk <
cctalk at classiccmp.org>:
> Hi all --
>
> In addition to the 11/45 project I'm also working on restoring an RF08/RS08
> fixed head disk/controller (in the vain hopes of one day running TSS/8 on
> my PDP-8/I). I have the power supply repaired and running and I'm getting
> ready to power the logic up (the disc itself will be a project all its own,
> once it arrives).
>
Fantastic. This thread sent me checking to see if I might have a DW08.
Doesn't seem that I do.
My notes indicate that somewhere I do have a DW8-E stashed somewhere -
at least the backplane - in offsite storage. I had forgotten about it.
If someone could use it, we could talk. [I suspect it was used to
connect a PDP-12 to an RK8E to run RK05's, but I have neither of those,
as far as I know.]
I also have another level shifter that I don't have documented (near as
I can tell). It is 11.5" high with M735 open collector modules, among
others, on it, but the label that I can see has faded to illegibility.
And as a result of investigating this in my PDP-12 notes, I found that
the power supply that Josh received from me had become a "donor" of a
rectifier bridge to my PDP-12 back in 1990. I suppose those wires were
just dangling on the unit when you received it.
> I'd like to double-check that all the flip
chips are in their right places;
> I have no cause to think they've been shuffled around but I want to be
> sure. The engineering docs have detailed schematics but no placement chart
> for the modules themselves. Given enough time with the schematics I could
> derive this chart but I'm saving that as a last resort. So, two
> possibilities here:
>
Wise man.
1) Does anyone
know of a document I've overlooked that includes module
placement?
2) Can someone with an RF08 and/or RS08 take a few detailed pictures of the
logic (from the handle side, of course) so I can compare? (Note: the
available RF08/RS08 pictures on the 'net are of the unit currently in my
possession, so are not useful in this regard!)
I have a RF08 / RS08 combo. It was connected to a PDP-8/L, but the cabinet
with the DW08 was missing.
I can take a bunch of pictures next weekend.
I have a vague idea that I have a bunch of docs with the unit. Double
ledger size or around A2. I will have a look.
Would be very interesting to read your story when repairing it!
/Mattis
> Thanks!
> - Josh
> 
25 Apr
25 Apr
1:56 p.m.
On 4/25/2021 1:42 PM, Josh Dersch via cctalk wrote:
2) Can someone with an RF08 and/or RS08 take a few
detailed pictures of the
logic (from the handle side, of course) so I can compare? (Note: the
available RF08/RS08 pictures on the 'net are of the unit currently in my
possession, so are not useful in this regard!)
This one might be useful for comparison:
https://www.computercollection.net/index.php/disk-drives/
https://www.computercollection.net/wp-content/uploads/2019/06/IMG_2241.jpg
It's a little out of focus toward the bottom.
https://www.computercollection.net/wp-content/uploads/2019/06/IMG_2243.jpg
Only one side of the drive electronics appears to be visible.
Vince
2:06 p.m.
On Sun, Apr 25, 2021 at 1:56 PM Vincent Slyngstad via cctalk <
cctalk at classiccmp.org> wrote:
On 4/25/2021 1:42 PM, Josh Dersch via cctalk wrote:
Yeah -- this is a picture of the exact unit currently in my possession. So
it matches 100% but tells me nothing useful ;).
- Josh
2) Can someone with an RF08 and/or RS08 take a
few detailed pictures of
the
logic (from the handle side, of course) so I can
compare? (Note: the
available RF08/RS08 pictures on the 'net are of the unit currently in my
possession, so are not useful in this regard!)
This one might be useful for comparison:
https://www.computercollection.net/index.php/disk-drives/
https://www.computercollection.net/wp-content/uploads/2019/06/IMG_2241.jpg
It's a little out of focus toward the bottom.
https://www.computercollection.net/wp-content/uploads/2019/06/IMG_2243.jpg
Only one side of the drive electronics appears to be visible.
Vince
1331
days inactive
1337
days old
9 comments
4 participants
participants (4)
-
cube1＠charter.net -
derschjo＠gmail.com -
mattislind＠gmail.com -
vincent.slyngstad＠gmail.com