On 12/10/2009 1:13 PM, Mike Naberezny wrote: > Hi Jim, > > On 11/30/09 10:06 AM, Jim Brain wrote: >> I mainly wanted one so I can see how CBM planned HDD storage (I have >> noticed an addition ',1' on the end of error strings, but maybe that's >> just BASIC 4.0's ?ds$ doing that.) > > I have noticed that CBM DOS 2.7 (8250 and SFD-1001) returns an extra > number after the track and sector. I've never read anything about > this but I believe it is the last-accessed drive number (0 or 1). > > This can even be seen on the SFD-1001, which is a single drive. If > you try to access the second drive on an SFD-1001 with DIRECTORY D1 or > similar and then PRINT DS$, you'll get "74,DRIVE NOT READY,0,0,1". > You'll get the same result using the equivalent BASIC 2.0 commands. > > The D9090 may have the same behavior and you accidentally accessed > drive 1, or it perhaps it has a different meaning that is specific to > DOS 3.0. I am sure I did not access drive 1, so I would be interested if folks could run a test on an SFD or 8250: put in a blank disk in drive 0, save some file and then scratch it from the disk, read the error channel after and see what number is returned. Jim Message was sent through the cbm-hackers mailing listReceived on 2009-12-11 06:00:03
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