Nextor use too many keys during the boot

[gdx-msx]

Hi Konamiman,

I talked with you about it before (a long time ago) on MRC but I restart my request to avoid key conflict with other interfaces, firmwares, etc. Please, see the thread at link below for the explanation with an example.

https://www.msx.org/forum/msx-talk/development/routine-to-bypass-a-firmware

The advantage is only one key would be used during the boot and even this one could not conflict because it would be usable only for a small period of time.

Other request: If possible, it would be nice to be able to "disable" slots that we specify (to prevent ROMs from being executed at startup).