Re: D9060 Help Needed

From: Mike Naberezny <>
Date: Thu, 10 Dec 2009 11:13:54 -0800
Message-ID: <>
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.


Mike Naberezny (

       Message was sent through the cbm-hackers mailing list
Received on 2009-12-10 20:00:04

Archive generated by hypermail 2.2.0.