"Bounce buffer" copyright [was Re: flash (or ide) storage for unibus 11?]

Charles Anthony charles.unix.pro at gmail.com
Sun Nov 29 15:22:15 CST 2015


On Sun, Nov 29, 2015 at 1:19 PM, Fred Cisin <cisin at xenosoft.com> wrote:

> it physically laid out the 10 sectors as 0 2 3 4 6 8 1 3 5 7 9 so that
>>> when reading sequentially, you had half a disk rotation to get your act
>>> together to read the next sector. This turned out to be only a small
>>> performance win, and was a pita for interoperability,
>>>
>>
> On Sun, 29 Nov 2015, Tapley, Mark wrote:
>
>> ….but, at least you had a functionally redundant sector 3!
>> :-)
>>
>
> That way, a system that could handle 1:1 interleave would get one version
> of sector 3, while one that could not handle 1:1 interleave would get the
> other one, and you could have different code for the two kinds of
> machines.    :-)
>
>
> But, that has 11 sectors on the track
> Were they 512 bytes each?
> Was it 8"? 5.25"?  SD?, DD?, "HD"?
>


8" on one side, 5.25" on the other.

-- Charles


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