At first I misread the subject as my 901lb wife….
Man I need my eyes checked! ;o)
Don Resor
Sent from someone's iPhone
> On Apr 15, 2024, at 7:04 PM, ED SHARPE via cctalk
> wrote:
>
> Bomar 901b My wife found in my stuff. Is this as scarce at it seems?s,?
>
>
> Sent from AOL on
On Wed, Apr 10, 2024 at 8:07 PM W2HX via cctalk wrote:
> 1. I have read that the card and the drives were compatible with the dec rx02
> drives. Why would the CRDS even bother to redesign a card where DEC had
> perfectly good working ones? Anyone know if there is any value in keeping the
>
Bomar 901b My wife found in my stuff. Is this as scarce at it seems?s,?
Sent from AOL on Android
On Mon, 15 Apr 2024, Tom Gardner via cctalk wrote:
The IBM 350 disk storage (RAMAC) has 5 million 6-bit characters or 3.75 MB; the
actual recorded characters were 8-bits in length including a parity bit and a
stop bit for each recorded 6-bit character
It was announced as part of the IBM 305
The IBM 350 disk storage (RAMAC) has 5 million 6-bit characters or 3.75 MB; the
actual recorded characters were 8-bits in length including a parity bit and a
stop bit for each recorded 6-bit character
It was announced as part of the IBM 305 RAMAC system which had drum memory
which as far as
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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