[Coco] 26-3022 Disk Controller Question

[Garrett Reynolds]

Good information, thank you.

Garrett

-----Original Message-----
From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Arthur Flexser
Sent: Saturday, September 2, 2017 9:02 PM
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Subject: Re: [Coco] 26-3022 Disk Controller Question

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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