15 Aug
2013
15 Aug
'13
1:24 p.m.
Hi Nico,
I'll check for any IBM labels when I get home on Saturday, but I don't
recall seeing any. Physically, the drive looks suspiciously similar to
the IBM 5444 at
http://www.theinquirer.net/inquirer/news/2074995/ibm-pictures-hardware-base…,
including the location of the spindle motor, and the big clamps on the
side.
The actual data to/from the drive is almost raw; there's just a
bitstream (at TTL level) from the controller to the drive to write,
and from the drive to the controller to read. So, other than
amplification and bit-shaping there is no processing in the drive (no
de-serialization); there is a fair bit of electronics in the drive for
seeking and head selection, though.
What does your interface look like? The CDD (cartridge disk drive)
controller in the P850 has a 74 pin card edge connector. Does your
controller look like the one in this picture on my website:
http://p800.wikispaces.com/CDD ?
Camiel
On Thu, Aug 15, 2013 at 5:22 PM, Nico de Jong <nico at farumdata.dk> wrote:
----- Original Message ----- From: "Al Kossow" <aek at bitsavers.org>
To: <cctalk at classiccmp.org>
Sent: Thursday, August 15, 2013 3:09 PM
Subject: Re: IBM 5440
On 8/15/13 3:26 AM, Nico de Jong wrote:
Well, when I look at the product specification, it is specified that ibm
5444 cartridges are used. The way I read the hardwaredocumentation, the
Philips machine takes the raw data, which could/should mean that no
logic/pre-handling is done in the drive. Of course I could be wrong.
I'll take a look at the p800 docs.
Camiel, should there be an IBM label besides the X12.. drives you have? Or
maybe something else indicating where the drive came from?
Nico
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Hi all
Would anyone know where I can find a IBM 5440 diskdrive, or even better :
a Philips 6875? They both use IBM 5444 cassettes, although with a different
number of segments per track
Nico
There were many, many companies that made OEM 5440-style disk drives, most
had slightly incompatible
interfaces or cabling from each other. Are you sure what you are looking
for are real IBM drives?
Looking at the X121x drive service manuals at
http://p800.wikispaces.com/Docs those drives are clearly European
designs at quite unlike IBMs (TTL logic and different head positioning
technology). The 2.5 vs 5 Mb difference
will be 200 vs 400 tracks.