Update:

It works!
You can combine:
- X-Pander 3
- Datel MIDI interface
- Ultimate 1541 - II+

For the Datel, set the DIP switches ON for IO1, IO2, and both POWER. All others 
OFF.
For the Ultimate:
- set the DIPs to all on
- disable any cartridge emulation
- disable RAM expansion unit
- in Audio config, don't have any SIDs in $DE00 to $DFFF





On Friday, November 29, 2019 at 2:23:52 PM UTC-5, Mike Horgan wrote:
> Hi There,
>
> I'd like to be able to use a Datel Midi interface cartridge alongside an 
Ultimate-1541-II for cynthcart.
>
> It appears cynthcart's prg ought to be able to run from the U-1541, but I 
suppose it could alternatively be a third cartridge.
>
> I'm evaluating either the X-Pander 3 from RETRO innovations, or the Mini 
X-Pander+ by Arkanix Labs.
>
> My preference would be:
> U-1541 (running cynthcart.prg)
> Datel Midi cartridge
> on the Mini X-Pander
>
> -or-
>
> U-1541 (running cynthcart.prg)
> Datel Midi cartridge
> on the X-Pander 3
>
> Alternatively:
> U-1541 (switched off, but plugged in)
> Cynthcart cartridge
> Datel Midi cartridge
> on the X-Pander 3
>
> I'm wondering if anyone can offer experience or rationale for why any of the 
above will/won't work.
>
> Cheers!
> --mike

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