[Coco] Re: Bellingham User Group Stuff

[Boisy Pitre]

On Feb 3, 2004, at 9:26 PM, Gene Heskett wrote:

> On Tuesday 03 February 2004 17:57, Boisy Pitre wrote:
>> I suspect that bit 1 of byte $10 in LSN0 is not set. It should be,
>> indicating to the driver that the disk is formatted as a 96tpi disk.
>>
>> Look at offset $10 of LSN0 of the disk image.  It should be $03, not
>> $02.
>>
>> Boisy
>>
> That would depend on whether he wrote them to a 5.25", or to a 3.5"
> diskette.  The 3.5 was 135 tpi from the gitgo, so that bit should not
> be set for a 3.5" formatted disk as there is never a chance of a tpi
> miss-match there.

Gene,

Thanks for the clarification.  You're correct: 135 tpi is the actual 
setting for 3.5" drives.

In my experience with the current cc3disk driver, you MUST set bit 1 of 
offset $10 in LSN0 of a disk image, in order to properly read/write 
that image on a 3.5" 720K floppy disk.

Boisy