Re: D9060 Help Needed

From: Jim Brain <>
Date: Fri, 11 Dec 2009 00:00:32 -0600
Message-ID: <>
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.


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Received on 2009-12-11 06:00:03

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