24 Aug
2012
24 Aug
'12
5:09 p.m.
> Seems familiar with some other systems.
> CP/M needed ^C when changing disks. So did MS-DOS! (sometimes)
> I never could find ANYWHERE in any Microsoft manuals any mention of
> pressing ^C when changing disks.
> Yes, it did sometimes use the cached DIRectory instead of the newly
> inserted disk!
On Fri, 24 Aug 2012, Dave McGuire wrote:
Isn't the volume serial number supposed to take
care of that problem?
"supposed to". so was the diskchange signal.
But, the volume serial number was not prexent on early disks - when did it
show up? 3.xx?
The volume serial number could be the same on two disks, if they had
originally been created (before being changed) as duplicates made with
earlier tools,
AND, it could still do it if the diskchange line was not
properly implemented (not at all uncommon with that line being used
sometimes for other purposes (ready?).
Without a diskchange signal, the system would have no reason to go look at
the serial number !