No it wasn’t. It’s true that the Utility disk does need to have the write-protect tab set to work properly. But my copies of the disk didn’t start working properly until I figured out the sector IDs and how to write them to the copy of the disk.
Kurt From: M100 [mailto:m100-boun...@lists.bitchin100.com] On Behalf Of Brian White Sent: Sunday, August 27, 2017 9:14 AM To: m...@bitchin100.com Subject: Re: [M100] Utility disk image from sector access It wasn't this simple? On Aug 23, 2017 8:16 PM, "Brian White" <bw.al...@gmail.com <mailto:bw.al...@gmail.com> > wrote: Did you open the write-protect tab on the disk? I have observed that it ignores an officially copied disk (made on a 720K disk using the backup utility), if the write-protect hole is closed. On Aug 23, 2017 4:05 PM, "Kurt McCullum" <kurt.mccul...@att.net <mailto:kurt.mccul...@att.net> > wrote: A bit too soon to declare total success. I can duplicate data disks without any issues. I can even duplicate the Utility disk. But even though the duplicate has all the same data, it won’t auto boot. So those extra save commands that I think play with the ID portion of the track are essential to creating a true duplicate of the Utility disk. I’ll get there but it’s going to take a bit to figure out the ID information. Kurt From: M100 [mailto:m100-boun...@lists.bitchin100.com <mailto:m100-boun...@lists.bitchin100.com> ] On Behalf Of Kurt McCullum Sent: Wednesday, August 23, 2017 10:13 AM To: m...@bitchin100.com <mailto:m...@bitchin100.com> Subject: Re: [M100] Utility disk image from sector access I’ll document what I’ve got John. The backup utility that uses floppy does some strange calls which I don’t understand at all. But, if one reads the tracks from 0 to 80 and then in turn writes them from 0 to 80, those calls are not needed. Backup does some extra reads to determine just how many sectors to copy instead of reading the entire disk. And there are some writes that I don’t understand at all. I suspect they have something to do with the ID of the sector but I’m not sure. Without a manual I’m just guessing. My utility is a simple brute force read of every track and then the same routine in reverse. Slow, but it works. Kurt From: M100 [mailto:m100-boun...@lists.bitchin100.com] On Behalf Of John R. Hogerhuis Sent: Wednesday, August 23, 2017 9:36 AM To: m...@bitchin100.com <mailto:m...@bitchin100.com> Subject: Re: [M100] Utility disk image from sector access On Wed, Aug 23, 2017 at 9:24 AM Kurt McCullum <kurt.mccul...@att.net <mailto:kurt.mccul...@att.net> > wrote: Success! I’ve got my utility reading AND writing TPDD2 disk images with the sector access commands. I’ve got a bit of cleanup and testing left to do and then I’ll put it in the members area. Kurt Documentation on the sector access protocol would be good too :-) It's the one dark corner of tpdd2 protocol (that we know of). -- John.