[Coco] Re: [Color Computer] Help for transfering Coco disk to PC

[Gene Heskett]

On Friday 25 March 2005 01:18, Sylvain De Chantal wrote:
>Hi Folks,
>
>I've tried to transfer Coco disks (i have about 130) to my PC (AMD
>Athlon, Win XP) after installing a TEAC FD-55 GFR floppy drive (a
>1.2meg high density) and using the Coco emulator of Jeff Vavasour
>(Version 1-15). I did configure the BIOS for the floppy (B: 5½
>1.2MEG) and configuring the emulator to read the B: floppy, but i
>still can't read anything.
>
>I've cataloged about 90 disks on my Coco and they work fine. So is
>there another way to transfer Coco disk to a PC ? Oh and i don't
> have a modem in my PC since i'm using a high-speed modem connected
> to the USB port.
>
>HHhhhheeeeellllllppppppppp!!!!!!!!
>
>--- Sly DC ---
>
Coco's disks are not going to be readable in a 1.2 meg drive, the 
spindle speed is wrong for starters.  The heads are too narrow for 
problem B, and problem C is the data rate.

Coco disks are only 35 track SS disks unless you were using os9, in 
which case the 720k drives were usable.  The 1.2 meg format uses a 
500kilobaud data rate, spinning at 360 rpm.  The Coco's used a 
250kilobaud data rate, with the disk spinning at 300 rpm.

You may be able to jumper that drive for 300 rpm, and the right 
switches in the driver may be able to slow the data rate down, but 
then can it double step that 96 tpi drive to emulate a 48 tpi drive?

Lots of problems and you would be far better off to try to find an old 
360k drive that would be far less work to make it work.

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
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Copyright 2005 by Maurice Eugene Heskett, all rights reserved.


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