The twisted cable is only at the end of the second connector, if I put the fist connector it is not affected. The twist only changes a: to b: or b: to a:
If I set the jumpers like you, a: or b: on EP have the same image like the stored in the emulated a:
The only way they act as separate drives is with the jumpers at the middle. Strange as you work with the same exdos card.
Do you remember you modified the card to work with pc drives? How I revert the changes? Or, if this is at last the error, can you modify the Manager to deal with the trick? Mostly because if I fix it then I don't have physical units to attach..