How much current for Camtronics boards, 5V logic side?

Hi

I am going to buy a "wall wart" rated at 5 volts to handle the logic
portion of Dan Mauch's 5 amp stepper driver boards. Will a 300mA
supply power the logic portion of 3 boards? (ie, 100mA each?) or do
you need more beef than that?

Again, this is not the motor supply, just the logic portion of his
boards.

Thanks, Tom.