> On Apr 15, 2024, at 10:05 AM, Christopher Zach via cctalk
> wrote:
>
>> If you want word-addressable, the RF11 will do that. Not the RC11, it has
>> 32 word sectors.
>
> Oh yeah, the pdp11 world had a DF32 like thing with the RF11. Totally forgot
> about that one.
>
> C
The RC11 is
Core memory yes - Drum memory I dont think so.
Rod Smallwood (Digital Equipment Corporation 1975 - 1985)
On 15/04/2024 08:06, Paul Flo Williams via cctalk wrote:
On Sat, 13 Apr 2024 17:26:31 -0400
Christopher Zach via cctalk wrote:
Was reading the Wikipedia article on Drum memories:
Always fun to see some of the flameouts that came from css. Sha tin always pops
to mind.
Sent from my iPhone
> On Apr 16, 2024, at 9:39 AM, Paul Koning via cctalk
> wrote:
>
>
>
>>> On Apr 16, 2024, at 10:15 AM, William Donzelli via cctalk
>>> wrote:
>>>
>>> I'll bet the source was
If you want word-addressable, the RF11 will do that. Not the RC11, it has 32
word sectors.
Oh yeah, the pdp11 world had a DF32 like thing with the RF11. Totally
forgot about that one.
C
> On Apr 16, 2024, at 10:15 AM, William Donzelli via cctalk
> wrote:
>
>> I'll bet the source was talking about large contemporary storage units that
>> looked like drums or may have been called "drums" but were not actual 50's
>> drum memory with tubes and such. There was no rotating drum
> I'll bet the source was talking about large contemporary storage units that
> looked like drums or may have been called "drums" but were not actual 50's
> drum memory with tubes and such. There was no rotating drum storage, the
> media rotates in the PDP era.
>
> Take a look at any pdp 11
On 15/04/2024 15:00, Bill Degnan via cctalk wrote:
I'll bet the source was talking about large contemporary storage units that
looked like drums or may have been called "drums" but were not actual 50's
drum memory with tubes and such. There was no rotating drum storage, the
media rotates in
On Mon, 15 Apr 2024, Douglas Taylor wrote:
had just acquired and needed to learn about. It was impressive, he said the
11/45 was missing the memory boards. If he shows up here on the list please
Not unusual; my 11/45 doesn't have memory boards (for the core system),
too. Instead, there is a
Don't know if it's germane, but the CDC STAR-100 (Cyber 200 series) MCU
used a small drum. 70s-80s. Don't recall if the stations did also.
There was the "STAR Drum" blue sky that was part of the boilerplate in
proposals at the time. STAR had a 512-bit wide data channel reserved
for a paging
On Mon, Apr 15, 2024 at 12:53 AM Christopher Zach via cctalk
wrote:
> Was reading the Wikipedia article on Drum memories:
>
> https://en.wikipedia.org/wiki/Drum_memory#External_links
>
> And came across this tidbit.
>
> As late as 1980, PDP-11/45 machines using magnetic core main memory
> and
> On Apr 15, 2024, at 1:15 PM, Tom Uban via cctalk
> wrote:
>
> I recall around 1980, the "A" machine at Purdue University Electrical
> Engineering, a PDP-11/70 running Version 7 Unix had a RS04 drum drive used
> for swap. It was getting long in the tooth and when a power failure occurred,
On Mon, Apr 15, 2024 at 10:19 AM Rick Bensene via cctalk <
cctalk@classiccmp.org> wrote:
> Bill wrote:
>
> The guy that took me on the tour said that the wall behind the drum had to
> be specially reinforced as if the drum exited the reinforced cabinet due to
> some kind of failure while at
And on the humble Univac 418 we had the FH330. I have a picture of them
somewhere
On April 15, 2024 1:47:01 p.m. EDT, Van Snyder via cctalk
wrote:
>On Mon, 2024-04-15 at 09:25 -0400, Paul Koning via cctalk wrote:
>> Are drums usually word addressable? That doesn't seem necessary, not unless
On Mon, 2024-04-15 at 09:25 -0400, Paul Koning via cctalk wrote:
> Are drums usually word addressable? That doesn't seem necessary, not unless
> you use them as main memory.
Univac FH432, FH880, and FH1782 were word-addressable "flying head"
drums, usually used for swap, on 1100-series and
Bill wrote:
> I'll bet the source was talking about large contemporary storage >
> units that looked like drums or may have been called "drums" but
> were not actual 50's drum memory with tubes and such. There was no >
> rotating drum storage, the media rotates in the PDP era.
> Take a look
I recall around 1980, the "A" machine at Purdue University Electrical Engineering, a PDP-11/70
running Version 7 Unix had a RS04 drum drive used for swap. It was getting long in the tooth and
when a power failure occurred, someone would have to get a wrench to help spin it up as the head
On Mon, Apr 15, 2024 at 8:00 AM Bill Gunshannon via cctalk <
cctalk@classiccmp.org> wrote:
>
>
> A README in the root of 2.11 says:
>
> The following manual pages are NOT in 2.10BSD but ARE in 4.3BSD:
>
> and one of them is drum.4
>
> so, I guess we need to look at a 4.3BSD system to find out
There were also spinning disk "drum" memories. I used to have one (or most
of one at least).
Sellam
There was drum storage for the early PDP-8 the "Straight 8", PDP-9 and
PDP-10. Each drum stored 32,768 words. Up to 8 of them could be
connected for a total storage of 262,144 words of storage.
IBM made a 5BM drum storage unit that was the side of a small
refrigerator: The RAMAC's disk
At the VFC East just a few days ago a young man came up to me, I had a
PDP11/53 on display, and showed me pictures of his 11/45 and PDP-8 that
he had just acquired and needed to learn about. It was impressive, he
said the 11/45 was missing the memory boards. If he shows up here on
the list
On Mon, Apr 15, 2024 at 12:53 AM Christopher Zach via cctalk <
cctalk@classiccmp.org> wrote:
>
>
> As late as 1980, PDP-11/45 machines using magnetic core main memory
> and drums for swapping were still in use at many of the original UNIX
> sites.
>
> Any thoughts on what they are talking
A README in the root of 2.11 says:
The following manual pages are NOT in 2.10BSD but ARE in 4.3BSD:
and one of them is drum.4
so, I guess we need to look at a 4.3BSD system to find out what
drum they are talking about. I have a feeling this is a device
that works on the VAX but is actually
On 4/15/2024 9:45 AM, Jonathan Chapman via cctalk wrote:
Well, I can submit a correction, but does anyone remember /dev/drum? I
don't recall that in V6m or V7 Unix, I guess I could fire one of them up
and see
There's at least references to /dev/drum in 2.11BSD, I forget if it was in the
> Well, I can submit a correction, but does anyone remember /dev/drum? I
> don't recall that in V6m or V7 Unix, I guess I could fire one of them up
> and see
There's at least references to /dev/drum in 2.11BSD, I forget if it was in the
docs or actually important stuff in the source. I don't
> On Apr 13, 2024, at 5:26 PM, Christopher Zach via cctalk
> wrote:
>
> Was reading the Wikipedia article on Drum memories:
>
> https://en.wikipedia.org/wiki/Drum_memory#External_links
I noticed the question was asked (but not answered): what is the largest
storage capacity found in
> On Apr 13, 2024, at 5:26 PM, Christopher Zach via cctalk
> wrote:
>
> Was reading the Wikipedia article on Drum memories:
>
> https://en.wikipedia.org/wiki/Drum_memory#External_links
>
> And came across this tidbit.
>
> As late as 1980, PDP-11/45 machines using magnetic core main memory
This uncited claim was introduced 15 years ago, along with the commit
comment "Hey, I saw drums (and core memory!) on PDP 11/45 hardware
running UNIX v6 (pre-BSD) in 1980 ... "
So, someone anonymous saw some once, somewhere, and promoted this to
"many sites."
Well, I can submit a correction,
On Sat, 13 Apr 2024 17:26:31 -0400
Christopher Zach via cctalk wrote:
> Was reading the Wikipedia article on Drum memories:
>
> https://en.wikipedia.org/wiki/Drum_memory#External_links
>
> And came across this tidbit.
>
> As late as 1980, PDP-11/45 machines using magnetic core main memory
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