K-MOUSE 2008

[Keeper]

But many other russian interfaces not use /DOS signal.
Signal /DOS is active in zero value (log.0) if TRDOS rom is active ?
If TRDOS is paged-in then signal /IORQ is always disabled ? If it is true, why I must accept signal /DOS ???

They are not using it cos`:
1. They are not using port #1F;
2. They are blocking Beta Disk ports by asserting IORQGE signal;
3. They are ugly

If TRDOS is paged in then you should not assert IORQGE signal, so if /DOS = (equal) 0 then IORQGE should be equal to zero (0) and your device should be disconnected from bus.

K-MOUSE interface contain switch for enable/disable port 31.

Nice!