[Coco] 720k sssd

[Stephen H. Fischer]

Hi,

That's what  thought.

The Flex disk reading program I remember takes entire control of the disk 
controller, the first DECB disk reading program did also.

Later the OS-9 disk driver added support for reading DECB disks.

I think that all CoCo disk controllers could do SD.

SHF


----- Original Message ----- 
From: "Bob Devries" <devries.bob at gmail.com>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Saturday, February 27, 2010 8:44 PM
Subject: Re: [Coco] 720k sssd


> The t0s parameter just sets the number of sectors on track 0, not its 
> density. I think that parameter historically was there to allow for SD 
> working, but not all controllers can do SD AFAIK.
>
> Regards, Bob Devries
>
> --
> Besides a mathematical inclination, an exceptionally good mastery of one's 
> native tongue is the most vital asset of a competent programmer.
>
> Edsger W.Dijkstra, 18 June 1975
>
> ----- Original Message ----- 
> From: "Gene Heskett" <gene.heskett at verizon.net>
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Sent: Sunday, February 28, 2010 3:26 PM
> Subject: Re: [Coco] 720k sssd
>
>
>> On Saturday 27 February 2010, Stephen H. Fischer wrote:
>>>Hi,
>>>
>>>I have read some 5-1/4 Flex disks where the first track was Single 
>>>Density.
>>>
>>>So Single Density disks can be read on a CoCo.
>>>
>>>But there may not be an option in Dmode!
>>>
>>>SHF
>>
>> Yes there is, its the "t0s", and is given in sectors per track just for 
>> track
>> zero.
>>>
>>>----- Original Message -----
>>>From: "Ryan Pritchard" <coconut at pritchard.ca>
>>>To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
>>>Sent: Saturday, February 27, 2010 6:29 PM
>>>Subject: Re: [Coco] 720k sssd
>>>
>>>>I only have 3.5" 1.44MB and 720KB drives to use with my CoCo, and they 
>>>>do
>>>>35 track single sided just fine...  I believe they are doing DD though..
>>>>Problem is I don't have many 720K diskettes to use with them to make the
>>>>drives work properly.  I am guessing you have some 720K disks that are 
>>>>SD?
>>>>
>>>> Regards,
>>>>
>>>> Ryan Pritchard
>>>> Fun Extends All Basic Life Expectancies
>>>>
>>>> On 2010-02-27, at 2:30 PM, Rick Ross wrote:
>>>>> Does anyone off the top of their head know the dmode for a 3.5 in to
>>>>> make it sssd?
>>>>>
>>>>> Thanks in advance
>>>>>
>>>>> Rick