sentences:  It also featured on-board buffer circuits to ease interfacing to "high voltage or high current" devices.One capability of the SYM-1 was its ability to allow an oscilloscope to be added to provide a 32 character display under software control.As explained in Chapter 7 of the "SYM Reference Manual", the vertical input, ground and trigger input of the oscilloscope were to be connected to the "Scope Out" connector AA on the SYM-1 board.