flash is a demo program. It flashes the drive LED. flash works with 1541, 1570 or 1571 drives. A 1581 drive is not supported.
For Linux, flash is not installed automatically. You have to
compile it yourself (found in
demo/flash/) if you want to use it.
For Windows, it is part of the binary distribution.
The optional parameter device is the device number of the drive which
should flash its LED. If not specified,
flash utilizes drive 8.
Let the drive LED flash on drive 10:
cbmctrl lock flash 10 cbmctrl unlock