It depend if it has stepper motors or servo motors, then it depends on the boards inside.
IE: A LSI, ZDI, NTP, ZCK, and ERS means a BOSS 6 and it has steppers.
EMC, FMDC is a BOSS 8. Servo motors
BSP, FMDC is a Boss 9. Servo motors.
LSI, ERS, CPL, is a BOSS 7 AKA BTC1 and has servo motors.
OLDER BOSS machines are determined by the part number of the ERS. They have a LSI, RCK, XDI, ERS and steppers.
Then there are the V2XT, EZTRAK, V2E3, etc.
ETC.
George
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)