I got a 3 digits Gotek for use on Atari ST and use also on PC-8801 and PC-9801/21. I want to know if it's possible to use A: B: drive "simultaneously" with only one device with Jeff's firmware, or do I need two devices Gotek for drive A and B?
In the boot Selector program for Atari ST mentions a jumper.
I attached photo

Thanks in advance.