On Tue, 9 Jul 2019 23:43:17 +
W2HX wrote:
> Thanks, Lyle. I was reading this. I guess its wrong?
>
> https://en.wikipedia.org/wiki/MicroVAX
>
> The MS630 memory expansion module was used for expanding memory capacity.
> Four variants of the MS630 existed: the 1 MB MS630-AA, 2 MB MS630-BA, 4
> The simple answer is to install it in a uVAX2 system and see what it
> says :-)
Or look up the part number on one of the DRAM chips, count the number
of DRAM chips, and then work out the total.
If the M7609 uses 256Kbit DRAM chips (as all MS630 boards do), then 9
of them are 256KB with parity,
BG Micro, a surplus electronics dealer I buy from sometimes, has diskettes for
sale. I don't know anything about them, but thought it may be of interest. I
have no affiliation other than being a customer on their mailing list.
Here is a link to the site:
https://www.bgmicro.com/4-pack-of-5-25
On 7/10/19 11:32 AM, Will Cooke via cctalk wrote:
> https://www.bgmicro.com/4-pack-of-5-25-floppy-diskettes-with-sleeves.aspx
They have hub rings, so they are probably 360K
At 12:25 PM 10/07/2019 -0700, you wrote:
>
>
>On 7/10/19 11:32 AM, Will Cooke via cctalk wrote:
>
>> https://www.bgmicro.com/4-pack-of-5-25-floppy-diskettes-with-sleeves.aspx
>
>They have hub rings, so they are probably 360K
And the index hole.
Thanks Will, this is quite fortuitous. I've just re
They have hub rings, so they are probably 360K
On Thu, 11 Jul 2019, Guy Dunphy via cctalk wrote:
And the index hole.
What about it?
There were some machines that didn't use the index (such as Apple and
Commodore), but they didn't care if there was one.
There were some that used 10 or 16 inde
On 7/10/19 7:14 PM, Fred Cisin via cctalk wrote:
>>> They have hub rings, so they are probably 360K
To add a bit to Fred's excellent explanation, I can offer the following:
While the hub ring is *generally* a good indicator of "2D" versus "HD"
disks, I've seen exceptions. Early 2D floppies did n
On Wed, 10 Jul 2019, Chuck Guzis via cctalk wrote:
While the hub ring is *generally* a good indicator of "2D" versus "HD"
disks, I've seen exceptions. Early 2D floppies did not use the hub ring
and I've got a few HD ones that do. The hub ring thing is a story in
itself, which I've gone into in
At 07:14 PM 10/07/2019 -0700, you wrote:
>On Thu, 11 Jul 2019, Guy Dunphy via cctalk wrote:
>> And the index hole.
>
>What about it?
Because it's so long since I used any 360K floppies, that I could not
recall if some didn't have any hole. (But I did remember about the soft/hard
sectoring; 1 vs n
DEC used to use the first letter of the suffix for density, and the second
letter for the chip manufacturer.
On Wed, Jul 10, 2019 at 12:08 PM Glen Slick via cctalk <
cctalk@classiccmp.org> wrote:
> > The simple answer is to install it in a uVAX2 system and see what it
> > says :-)
>
> Or look up
At 08:27 PM 10/07/2019 -0700, Grumpy Ol' Fred wrote:
>The 5.25" diskette or "Mini-diskette" is bar napkin size, because Dr. Wang
>said that 8" diskettes were too big. I have not been able to track down
>WHICH bar.
Perhaps the same bar where someone bet L Ron Hubbard that he couldn't create a
r
"360K" - 300 Oersted. vs 1.2M 600 Oersted.
On Thu, 11 Jul 2019, Guy Dunphy wrote:
Can you believe that is the first time I have ever heard the actual figures for
the coatings?
I knew the 1.2M type had a higher coercivity, thus the incompatibility. Ditto with
3.5" 720K
vs 1.44M.
Then add to
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