[Coco] XPander-Coco lives!

[RETRO Innovations]

On 8/31/2015 7:58 PM, Mark Marlette wrote:
> Jim
>
>
> The only thing that I can think of is SLENB*. It is used to get the ghosting of certain floppy disk controllers off the bus. This is for ROM access only. The IDE hardware is IOmapped at $FF50-$FF59 by default.
I don't manage SLENB, but I do turn on the data bus buffer (ls245) on 
when I see SLENB low,
>
> Jim O. contacted me today and indicated that his sIDE was defective.  If it was inserted with power applied it is more than likely bad.
Yep, and if there is a cost to fixing it, charge me, as I am the cause, 
at least indirectly.
> Maybe that is why it didn't work if you are handling SLENB* properly.
Well, they said it was not working before the unit went bad.  It would 
work as the only cart in the MPI, but when they put a 500 or 501 in the 
system, it gave errors.  I can trace SLENB.

Now, SLENB is not buffered by the device, so maybe the signal is getting 
slewed too badly.  I guess I should have scoped it last weekend.

Anyone have a SuperIDE and a FD500/501/502 they might let me borrow or 
rent? :-)  Or, maybe I can wire up the SLENB signal to a temp gate to 
buffer it, and send the unit to someone for testing who has a setup that 
includes the SuperIDE.
>
> To date that has been the only problem with returned sIDEs for repair.
>
> Regards
>
> Mark
>
> www.cloud9tech.com
>
>
> Sent from Yahoo Mail on Android
>
> From:"RETRO Innovations" <go4retro at go4retro.com>
> Date:Mon, Aug 31, 2015 at 7:03 PM
> Subject:[Coco] XPander-Coco lives!
>
> For those who care, I was able to have folks test my MPI replacement at
> the recent VCF-MW show.  They ran it through paces, and things worked
> well.  There were, however, two issues I need to disposition:
>
> 1) No power switch on the unit.  I didn't think of needing it, but one
> should power off the unit when swapping carts.  I will add a suitable
> switch.  No issues there.
> 2) SuperIDE did not seem to like being in the MPI with other FD500/FD501
> carts.  My understanding is that they work in the original MPI, so I
> need to figure out what makes SuperIDE special and address that issue.
> I am hoping Mark will see this and can offer some suggestions.  CocoSDC
> and the FDXXX carts worked fine, so I think the concern with with
> SuperIDE alone.
>
> I am sure folks got some pics at the show, so I'll let others send links.
>
> Jim
>


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