9 Feb
2010
9 Feb
'10
3:03 p.m.
Rob wrote:
anyway... I've found somebody that has an archive
of their pages from
Prestel, and we'd both liketo get them up on the site. The snag, for
me, is that a lot of it is on 8" discs, from a Technologics(?) system.
The photographs of the discs I have seen show them labelled as 48tpi,
soft sectored.
Find someone who can lend me a 48tpi 8in drive and I'll image them with
the DiscFerret analyser prototype (currently sitting on my desk next to
me). Think "Catweasel with attitude".
That'll get you a raw, timing-value image of the disc, which can then be
processed with a suitable decoder (suspect it's probably FM encoding,
IBM/ECMA-format or some variant thereof) to recover the data.
If nothing else it gives me more test data to feed to the analyser
(never a bad thing) and another format to reverse-engineer.
--
Phil.
classiccmp at philpem.me.uk
http://www.philpem.me.uk/