[Coco] Issues with 26-3022 interface

[Daniel Campos]

Hi Mark,

I understand your point, as this subject have probably been talked on 
this list many times over. But my main purpose is to pass disk images 
from a PC (through emulator or some other program) and run them on the 
Coco. I don't have any legacy 5 1/4 disks to worry about, so if I can do 
this work on a 3 1/2 floppy, for me is the best choice.

I will try now to transfer some images from the PC to this disks and 
let's see how will it work...

Thanks!
Daniel

Em 12/02/2013 13:04, Mark Marlette escreveu:
> Daniel,
>
> Understand the beast in which you are trying to tame.......... :)
>
> Go read what occurs and the differences between all of the disk formats and densities on a hardware and software level.
>
> You will then realize as it 'might' appear to have worked, you are in violation of the specs.
>
> This has been beat to death here. Follow the specs and it will always work.  You are flirting with diasater if you assume it is working, IMHO.
>
> Regards,
>
> Mark
>
> http://www.cloud9tech.com
>
>
>
> ________________________________
>   From: Daniel Campos <daniel.campus at gmail.com>
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Sent: Tuesday, February 12, 2013 8:50 AM
> Subject: Re: [Coco] Issues with 26-3022 interface
>   
> Mark,
>
> Em 12/02/2013 11:56, Mark Marlette escreveu:
>> Daniel,
>>
>> This HD mod was created by Robert Brose of our computer club many years ago.
>>
>> I have done this mod, it works. I also added a line from the controller to the drive to automatically switch the transfer rate clock based upon the sensors in the drive rather than just the descriptor.
>>
>> With that said...this is NO easy mod. Almost easier making a new controller.
> Yes, for what I saw from the document that Harry sent, it will be no
> easy task.
>
>> It requires a the MB8877A(??) memory loss ATM upgrade and then there was also a speed issue running at 1.78MHZ as well. A chip that needed replacing. Was pinged this past weekend on this at Cloud-9 and haven't had the chance to look up my work in my project documentation book. I have it.
>>
>> The file was up on RTSI for a long time. ????
>>
>> Regards,
>>
>> Mark
>> http://www.cloud9tech.com
>>
>>
>>
> Ou of curiosity, I just attached today a 3 1/2 1.44M drive to the Coco
> and it worked flawlessly! It formated the disk (a HD disk with the role
> closed to make the drive understand it as 720Kb disk) and SAVEd and
> LOADed some programs. No errors ocurred during the format process!
> How can I check the disk to see if it was formated properly ?
>
> This drive is a Mitsumi D359M3D and was already configured to DS0,
> because I used it before with one of my MSX machines.
>
> Thanks!
>
> Daniel
>
>
>
>
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