cwilson@NISC.SRI.COM (Chan Wilson [Animal]) (01/10/91)
How is it possible to identify a ProDOS disk? I'm looking for a magic
number of some sorts, someplace, anywhere.
Ideally, it'd be a magic number someplace near the front. I'm into dealing
with disks as data streams at the moment...
Hep Me!
--Chan
Chan Wilson Chief Hard-Question Answer Person
SRI Intl. Network Information Systems Center
333 Ravenswood Ave., EJ287 Internet: cwilson@nisc.sri.com
Menlo Park, CA., 94025 Phone: (415)859-4492
"If I want to be a surfer this month, I bloody well will be."dlyons@Apple.COM (David A. Lyons) (01/28/91)
In article <25235@fs1.NISC.SRI.COM> cwilson@NISC.SRI.COM (Chan Wilson [Animal]) writes: >How is it possible to identify a ProDOS disk? I'm looking for a magic >number of some sorts, someplace, anywhere. > >Ideally, it'd be a magic number someplace near the front. I'm into dealing >with disks as data streams at the moment... > >Hep Me! > >--Chan > >Chan Wilson Chief Hard-Question Answer Person >SRI Intl. Network Information Systems Center >333 Ravenswood Ave., EJ287 Internet: cwilson@nisc.sri.com >Menlo Park, CA., 94025 Phone: (415)859-4492 > "If I want to be a surfer this month, I bloody well will be." Try verifying the sanity of the image of block 2. If it's ProDOS, you will have a zero backward link to the previous directory block, a disk name in the form $Fx + X characters + $00s filling the remainder of the 16 byte field (counting the length byte); the characters in the name will all be upper-case A-Z, 0-9, and period (lowercase characters in the name are flagged separately). -- David A. Lyons, Apple Computer, Inc. | DAL Systems Apple II System Software Engineer | P.O. Box 875 America Online: Dave Lyons | Cupertino, CA 95015-0875 GEnie: D.LYONS2 or DAVE.LYONS CompuServe: 72177,3233 Internet/BITNET: dlyons@apple.com UUCP: ...!ames!apple!dlyons My opinions are my own, not Apple's.
gvrod@CCVAX.IASTATE.EDU (R Eldridge, VAX Systems) (01/28/91)
In article <25235@fs1.NISC.SRI.COM> cwilson@NISC.SRI.COM (Chan Wilson [Animal]) writes: >How is it possible to identify a ProDOS disk? I'm looking for a magic >number of some sorts, someplace, anywhere. > >Ideally, it'd be a magic number someplace near the front. I'm into dealing >with disks as data streams at the moment... > >Hep Me! > >--Chan > >Chan Wilson Chief Hard-Question Answer Person SRI Intl. Network Information Systems Center >333 Ravenswood Ave., EJ287 Internet: cwilson@nisc.sri.com >Menlo Park, CA., 94025 Phone: (415)859-4492 > "If I want to be a surfer this month, I bloody well will be." how about just calling the ON_LINE function for the device. according to the prodos-8 technical reference manual, ON_LINE can return error number $52 (not a prodos disk) ============ rod eldridge gvrod@isuvax.bitnet vax systems gvrod@isuvax.iastate.edu iowa state university bus: (515) 294-7498 postmaster@isuvax.bitnet fax: (515) 294-1717 postmaster@isuvax.iastate.edu