On Thu, 7 Mar 2002, Eric J. Korpela wrote:
> There's more technical info at http://www.atsf.co.uk/dottext/domesday.html
> The videodisk players were specially modified for this purpose.
>
> "The data channel appears on a SCSI bus ... and SCSI had only just been
> standardised at this time. This means that the player looked to the host
> computer like a very large, somewhat slow, read-only hard disc. We had
> never used a CD-ROM at that point. A read-only version of the BBC Micro
> hierarchical disc filing system, now called VFS (for Videodisc Filing
> System), is used to access the data in a way that adhered to the filing
> system standards. In this way any code written for one filing system
> could be used with another, providing both use the same subset of the
> whole standard. Write-only systems obviously do not have sector write
> primitives or means of modifying file attributes for example."
>
> It sounds like images were stored as PAL frames and were converted to RGB
> for mixing with the BBC RGB output.
If someone actually knows how the data is encoded then it doesn't sound
very "unreadable" to me.
Sellam Ismail Vintage Computer Festival
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Received on Thu Mar 07 2002 - 09:57:02 GMT