comp.sys.cdc Google Group

Re: SMD-E specification wanted

e...@brouhaha.com (Eric Smith) — Tue, 26 May 2009 00:01:57 UT

Not a problem. Data fields and gaps are pretty obvious. I can
reverse-engineer the sector format and ECC; I've done it before on
other kinds of drives.
The bigger problem will be if SI was doing any RAID or RAID-like
functionality across multiple drives, or if they did anything else that
prevents the logical data from being organized in an obvious way with

Re: SMD-E specification wanted

s.f...@pleaseremove.att.net (Stephen Fuld) — Mon, 25 May 2009 15:56:09 UT

snip
Remember, SMD just gave you access to the raw bits on the drive. In
order to recover the data, you would need to understand the format of
the headers, the sizes of the data fields and gaps, and whatever ECC was
used. These would be a function of the SI controller, not the drive, so
you need to get information on them as well.

Re: SMD-E specification wanted

e...@brouhaha.com (Eric Smith) — Mon, 25 May 2009 04:27:47 UT

I wrote:
I knew they added tag 4-6 for more cylinders and other purposes, but I
want to find out whether the electrical specifications changed to
allow the 24 MHz data rate. I'm not convinced that the SN75110A
differential drivers and SN75108 differential receivers required by
the original SMD spec are fast enough for 24 Mbps use.

Re: SMD-E specification wanted

s.f...@pleaseremove.att.net (Stephen Fuld) — Thu, 21 May 2009 19:56:29 UT

Boy, it has been a while. We stopped using SMD interface disks by the
mid to late 1980s. I no longer have a copy of the spec, but I do
remember at least some of the differences. One was increasing the data
rate to 24 Mhz (3 MB/sec). I think they also redefined one signal to
allow more than 1024 cylinders. But my recollection is pretty hazy.

SMD-E specification wanted

e...@brouhaha.com (Eric Smith) — Thu, 21 May 2009 00:48:48 UT

Does anyone have a copy of the SMD-E Interface Specification, which is
CDC/Imprimis/Seagate document 64712402? The spec for the earlier SMD
interface is on Bitsavers, but it doesn't look like the SMD-E spec is there.
Thanks!
Eric

Google group called "SIA People", for ex-employees and friends of SIA "Compter Services" originally known as "Service in Informatics and Analysis".

martyntwri...@yahoo.com — Thu, 29 Jan 2009 09:46:58 UT

For those who might be interested, there is a Google group called "SIA
People", for ex-employees and friends of SIA "Computer Services"
originally known as "Service in Informatics and Analysis". SIA
installed the first CDC 6600 in the United Kingdom and ran a
successful commercial batch and timesharing service. For more info on

CDC Diode transfer circuitpatent

thunter0...@yahoo.com.au — Mon, 08 Sep 2008 14:52:29 UT

Please follow the link below to the CDC "Diode transfer circuit"
patent by Jim Thornton and Seymour Cray:
[link]

CDC Multimode data processing system patent

thunter0...@yahoo.com.au — Mon, 08 Sep 2008 14:48:20 UT

Please follow the link below to the CDC "Multimode data processing
system" patent by Seymour Cray:
[link]

CDC Twisted pair transmission system patent

thunter0...@yahoo.com.au — Mon, 08 Sep 2008 14:45:32 UT

Please follow the link below to the CDC 6600 twisted pair transmission
system patent by Les Davis:
[link]

CDC 6600 CPU patent

thunter0...@yahoo.com.au — Mon, 08 Sep 2008 14:38:31 UT

Please follow the link below to the CDC 6600 CPU patent by Seymour
Cray and Jim Thornton:
[link]

CDC 6600 PP patent

thunter0...@yahoo.com.au — Mon, 08 Sep 2008 14:33:43 UT

Please follow the link below to the CDC 6600 PP patent by Seymour Cray
and Jim Thornton:
[link]

Re: Old CDCer

frankc...@gmail.com (FrankCato) — Thu, 28 Aug 2008 13:01:09 UT

Hi...
I`m looking to get in touch with Mike Pacenza... I have lost my email
adress from when we worked together at Globus 2 in Norway. Do you have any
contact information?
Best regards Frank Lahti

comp.sys.cdc Vice-President

alvin.beny...@gmail.com — Thu, 14 Aug 2008 22:57:51 UT

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