> On Aug 14, 2023, at 11:52 AM, Paul Koning via cctalk
> wrote:
>
>
>
>> On Aug 14, 2023, at 12:42 PM, Chuck Guzis wrote:
>>
>> On 8/14/23 06:07, Paul Koning wrote:
>>
https://ia800809.us.archive.org/30/items/TNM_Control_Data_807-808_Disk_Files_-_Control_Dat_20170826_0047/TNM_Control
On 8/14/23 15:42, Fred Cisin via cctalk wrote:
On Mon, 14 Aug 2023, Paul Koning via cctalk wrote:
It's been a while, but I think that RAID originated in
academia, though Cray may well have been one of the
earlier commercial users.
https://www2.eecs.berkeley.edu/Pubs/TechRpts/1993/6306.html
ht
On Mon, 14 Aug 2023, Paul Koning via cctalk wrote:
It's been a while, but I think that RAID originated in academia, though
Cray may well have been one of the earlier commercial users.
https://www2.eecs.berkeley.edu/Pubs/TechRpts/1993/6306.html
https://www2.eecs.berkeley.edu/Pubs/TechRpts/1993/C
> On Aug 14, 2023, at 1:48 PM, Milo Velimirović
> wrote:
>
>
>
>> On Aug 14, 2023, at 11:52 AM, Paul Koning via cctalk
>> wrote:
>>
>>
>>
>>> On Aug 14, 2023, at 12:42 PM, Chuck Guzis wrote:
>>>
>>> On 8/14/23 06:07, Paul Koning wrote:
>>>
> https://ia800809.us.archive.org/30/it
> On Aug 14, 2023, at 12:42 PM, Chuck Guzis wrote:
>
> On 8/14/23 06:07, Paul Koning wrote:
>
>>> https://ia800809.us.archive.org/30/items/TNM_Control_Data_807-808_Disk_Files_-_Control_Dat_20170826_0047/TNM_Control_Data_807-808_Disk_Files_-_Control_Dat_20170826_0047.pdf
>>
>> That drive was
On 8/14/23 06:07, Paul Koning wrote:
>> https://ia800809.us.archive.org/30/items/TNM_Control_Data_807-808_Disk_Files_-_Control_Dat_20170826_0047/TNM_Control_Data_807-808_Disk_Files_-_Control_Dat_20170826_0047.pdf
>
> That drive was the fastest transferring disk, by a large margin, for quite a
>
> On Aug 13, 2023, at 5:55 PM, Chuck Guzis via cctalk
> wrote:
>
> On 8/13/23 12:48, Mike Stein via cctalk wrote:
>> Yup; I think I've got a couple of each type somewhere; don't recall who the
>> other ones were, but two are definitely Canon.
>
> Just a late imitation of the CDC 808 hard dis
On 8/13/23 12:48, Mike Stein via cctalk wrote:
> Yup; I think I've got a couple of each type somewhere; don't recall who the
> other ones were, but two are definitely Canon.
Just a late imitation of the CDC 808 hard disk drive--the difference
being that the 808 could handle several tracks at once
Yup; I think I've got a couple of each type somewhere; don't recall who the
other ones were, but two are definitely Canon.
On Sun, Aug 13, 2023 at 3:22 PM Fred Cisin via cctalk
wrote:
> >> Yes, absolutely. One spindle motor, with a floppy hub on each end, and
> >> two heads on one voice coil po
Theoretically it could be done with only 2 motors--one spindle motor and
one positioner. Probably not the best for performance, but doable.
--Chuck
That is exactly what they did. There is only one stepper motor that
drives both heads. And one drive motor that drives both spindles.
Simple,
Yes, absolutely. One spindle motor, with a floppy hub on each end, and
two heads on one voice coil positioner, one for each floppy. I had one
of those. The performance improvement was VERY marginal. I had to take
out the solenoid that lifted the pad that loaded the media against the
head, the
On 8/13/23 09:43, Jon Elson via cctalk wrote:
> Yes, absolutely. One spindle motor, with a floppy hub on each end, and
> two heads on one voice coil positioner, one for each floppy. I had one
> of those. The performance improvement was VERY marginal. I had to take
> out the solenoid that lifte
On 8/13/23 11:25, Tony Duell via cctalk wrote:
On Sun, Aug 13, 2023 at 5:20 PM Nigel Johnson Ham via cctalk
wrote:
The DEC Rainbow RX50s only have one motor :-)
{being pedantic}
No they don't. They have 2. A permanent-magnet DC motor used to drive
both spindles and a stepper motor used to pos
On Sun, Aug 13, 2023, 10:20 AM Nigel Johnson Ham via cctalk <
cctalk@classiccmp.org> wrote:
> On 2023-08-13 12:18, Warner Losh via cctalk wrote:
> > On Sun, Aug 13, 2023, 10:11 AM Chuck Guzis via cctalk<
> cctalk@classiccmp.org>
> > wrote:
> >
> >> On 8/13/23 08:39, Nigel Johnson Ham via cctalk wr
On Sun, Aug 13, 2023 at 5:20 PM Nigel Johnson Ham via cctalk
wrote:
> The DEC Rainbow RX50s only have one motor :-)
{being pedantic}
No they don't. They have 2. A permanent-magnet DC motor used to drive
both spindles and a stepper motor used to position both heads.
But I will agree it is a lot
On 2023-08-13 12:18, Warner Losh via cctalk wrote:
On Sun, Aug 13, 2023, 10:11 AM Chuck Guzis via cctalk
wrote:
On 8/13/23 08:39, Nigel Johnson Ham via cctalk wrote:
You've amplified my point, Fred! When I saw the abomination of
cross-over selects in the cables in the IBM PC, I knew the nee
On Sun, Aug 13, 2023, 10:11 AM Chuck Guzis via cctalk
wrote:
> On 8/13/23 08:39, Nigel Johnson Ham via cctalk wrote:
>
> > You've amplified my point, Fred! When I saw the abomination of
> > cross-over selects in the cables in the IBM PC, I knew the need for
> > Field Service Engineers was comin
On 8/13/23 08:39, Nigel Johnson Ham via cctalk wrote:
> You've amplified my point, Fred! When I saw the abomination of
> cross-over selects in the cables in the IBM PC, I knew the need for
> Field Service Engineers was coming to an end!
>
> I don't believe anything on Wikipedia anymore. When I
On 2023-08-12 22:30, Fred Cisin via cctalk wrote:
Could y'all clarify for me,
Do you mean "drive 3" and "drive 4" of drives 1-4, or 0-3?
do you mean "DS2" and "DS3" of DS0-DS3, or DS1-DS4?
On Sat, 12 Aug 2023, Nigel Johnson Ham via cctalk wrote:
As far as i know, winchester drive selects have
Could y'all clarify for me,
Do you mean "drive 3" and "drive 4" of drives 1-4, or 0-3?
do you mean "DS2" and "DS3" of DS0-DS3, or DS1-DS4?
On Sat, 12 Aug 2023, Nigel Johnson Ham via cctalk wrote:
As far as i know, winchester drive selects have always been 1-4, at least in
the DEC world!
Refe
As far as i know, winchester drive selects have always been 1-4, at
least in the DEC world!
Reference MP-02259-01 RQDX3 Field Maintenance print set. Also Plessey
DCV54 manual.
I don't know about PCs- I went into teaching when the PC came out 'cos
there wasn't enough money in PCs! I was ge
On August 12, 2023 6:35:35 p.m. EDT, Peter Coghlan via cctalk
wrote:
IIRC I had to jumper the second MFM drive as drive 4. Presumably I should
have made a twist in the cable to allow the second MFM drive to be configured
as drive 3, the same as the first drive.
On Sat, 12 Aug 2023, Nigel Joh
>From memory, when I looked into doing this I found that the RQDX3 BA23
>distribution panel maps DS2 from the contriller to all DS pins on the B cable
>of one drive and DS3 to all DS lines on the other. I never did test the theory
>though. I did not get a special adapter from decromancer.
Hope
>
> I have a Gesswein MFM emulator from decromancer.ca; who offer an adaptor
> that yields a 2nd MFM data connector.
> I'll use mine in a Microvax 2000. Does anyone know how to hook it up as
> two MFM drives in a Microvax 2000?
>
> The vendor sold a 1in high adaptor box, BA40A, with DD50 connect
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