[Coco] Preserving old CoCo diskettes...

[Darren A]

On 5/18/10, Boisy G. Pitre wrote:
>
> I make this assertion based on my understanding of the design of the Drive
> Pak vs. the SuperIDE.  As I understand it, Drive Pak uses a 6551 to talk to
> the SD card.  If this is correct, then it means that Drive Pak's throughput
> is ultimately bound by the speed at which the 6551 talks to the SD card,
> which is either 115,200 or 230,400 bps.  For benefit, let's assume it is the
> latter. This means that at a rate of 230,400 bps, the theoretical maximum
> throughput that you can hope to achieve is:
>
>        230,400 bits per second / 8  = 28,800 bytes per second
>

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Yes. It does operrate at 230,400 bits per second, but when you include
start and stop bits there are 10 bits per byte (23,040 bytes per
second).

Darren