[Coco] FD-501 w/ 3 1/2" added

[Ronivon Costa]

I was just discussing floppy drives and 720K with some other guy, and
he told me he really likes the Samsung SFD 321B, because it has smd
components (replacing the easier jumpers, I know) to set the drive for
DS0 or DS1, and even the RDY signal (required by some vintage
computers, I think like the CPCs and PCWs).

To set the drive to A or B, you will have to desolder the small
component and move it to around to a new place... sort of something
like this.


On 12 September 2013 21:37, Bruce W. Calkins <brucewcalkins at charter.net> wrote:
> ----- Original Message ----- From: "Bill"
>
> Does anyone have one of these creatures?
>
> I'm trying to do exactly that, but I cannot get the 3 ½" to work properly.
>
> Neither of them has a jumper or switch to tell which is D0 or D1.
>
> Do I need to make a twist in the cable to accomplish this?
>
> Please contact me privately so we can discuss this solution.
>
> Thanks
> --
> I have several 3.5" drives hooked to CoCos.
> 3.5" drives without jumpers or switches need a twisted cable.  Basically you
> need to figure out which drive select line you want to go to the 3.5" drives
> drive select 1 line.  So you should be able to run a single non-adjustable
> 3.5" drive as drive 1.  To use it as drive 0 you need to twist the 1 and 0
> select lines so the 1 line is available for the other drive.  Another option
> is to pull the drive select lines to a DPDT switch wired as a reversing
> switch so your 5.25" and 3.5" drives can be switched.
> Bruce W.
>
> --
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