Re: 13 sector disk images?

[pausch@saaf.se (Paul Schlyter)]

In article <4572b177$0$92476$c30e37c6@lon-reader.news.telstra.net>,
Tristan Mumford  <nintendologist@nospam.gmail.nospam.com> wrote:

> On Wed, 29 Nov 2006 18:47:12 +0000, Andy McFadden wrote:
> 
>> David Williams <dlw@trailingedge.com> wrote:
>>> I was able to get my IIgs set back up and running where I can play with it 
>>> again and have been wanting to archive off some disc images.  I can handle 
>>> regular 16 sector images just fine but does anyone have any pointers on 
>>> getting 13 sector images?  I have a few discs I'd like to save.  Any 
>>> pointers at all on saving images would be fine too.
>> 
>> Well, there's a 13-sector version of ADT:
>> 
>>  ftp://ftp.apple.asimov.net/pub/apple_II/unsorted/adt-1.22-13-sector.txt
>>  ftp://ftp.apple.asimov.net/pub/apple_II/unsorted/adt-1.22-13-sector.zip
>> 
>> It creates ".d13" files.  I think there's a d13-to-nib converter out there,
>> which you need to use until emulators recognize ".d13".  CiderPress can do
>> the conversion as well.
>> 
>> - Andy
> 
> Sweet.
> What about odd CP/M disks? 
> I recall I have quite a few unreadable ones with ADT. Or are they just 13
> sector too?

The only 13-sector CP/M disks I know of was the Softcard System disk
which came as both 13-sector and 16-sector with early versions of the
Softcard.  Some Microsoft languages such as Fortran-80 may have been
distributed on both 13-sector and 16-sector disks too.

Back in the 1980's, I ran 16-sector CP/M before I had access to 16-sector
DOS 3.3 .... no, softcard CP/M didn't have the 16-sector boot PROM with it,
you had to have the Pascal language system for that before DOS 3.3 was
released.

You could try to boot the disk with a 13-sector boot PROM to find out
if it's a 13-sector CP/M disk -- no Z80 card will be needed: if the boot
code fails to find any appropriate Z80 card, it will tell you so on the
screen.  Otoh, not all CP/M disks came with CP/M on the system tracks,
you usually had to put it there yourself (the system disks had CP/M on their
system tracks of course).

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