[Coco] 26-3022 Disk Controller Question

[Arthur Flexser]

I believe replacing the 1793 with an 8877A does work as you describe, and
I'm almost sure it worked for me that way, long ago.  As I recall, I
discovered this fact accidentally, having replaced with the Fujitsu chip
because I couldn't find a 1793.

Art

On Sat, Sep 2, 2017 at 11:26 PM, Garrett Reynolds <greynolds86 at hotmail.com>
wrote:

> I picked up a Drive 0 1st generation (grey) single floppy drive and
> controller.  The original label is missing but I assume this is the 26-3022
> as it is equipped with the WE FD1793B-02.  I understand this controller is
> not very popular or reliable.  I've read that it will not work on the
> CoCo2/3 (I have a CoCO3).  I believe this is because it needs 12VDC to
> function which is not present on the later computers or needed by the newer
> controllers (that's weird to say, "newer controllers").
>
> Anyway, I've read that if you replace this DIP CHIP with a Fujitsu MB8877A
> that it will then work with the CoCo2/3.  I found several of these chipsets
> on ebay for around $10.  Does anyone have experience with this controller,
> the modification that I speak of and any recommendations as to making this
> controller work with my CoCo3?
>
> I did open the controller, seat the components, and cleaned up the pins
> and confirmed that controller boots to DECB.  I did not attempt to plug in
> the drive or access it pending answers to these questions.
>
> I also read that if you have a multi-pak that this controller will work
> without modification, but I do not have one.
>
> Your ideas/suggestions are graciously invited.
>
> Garrett
>
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