3niti alpha simu1 is not a TRUE ternary computer, but more likely a stand-alone emulator of ternary computer based on binary microcontroller (PIC16F870) with TRUE ternary visualization (15 three-state red-green LEDs):

• Lights 1,2,3,4,5,6,7,8,9 (A8...A0) - value of PC register (address of current operation)
• Lights 10,11,12 (D2...D0) - 3-trit data (see below)
• Lights 13,14,15 (Register A) - current value of A register

and TRUE ternary controls (15 three-state slide switches):

• Switches 1,2,3,4,5,6,7,8,9 (A8...A0) - some 9-trit address entered by user
• Switches 10,11,12 (D2...D0) - some 3-trit data entered by user

• Switch 13 (W/R) - control input/output ternary switch:

  P (top position) - using specified address write data to the memory (data lights display this 3-trit data)
  O (neutral position) - ignore address and data switches (data lights display data from memory address PC)
  N (bottom position) - ignore data switches and display data from specified address
  

• Switch 14 (I/M) - control subprogram ternary switch:

  P (top position) - interrupt main program, save current PC and jump to specified address
  O (neutral position) - do not disturb working program
  N (bottom position) - stop subprogram and restore PC to return to main program
  

• Switch 15 (S/G) - control step/run ternary switch:

  P (top position) - execute one step of the program
  O (neutral position) - pause mode
  N (bottom position) - run program from current position
  

Computer operates 3-trit words - triads. Each triad may hold 3^3=27 different values. Whole set of instructions of ternary computer "3niti alpha" are written on the board itself -for more info about it you can go to 3niti.org

Also you can read about it on Hackaday.io: 3niti alpha

By default you will get bare PCB board without any components, but you can choose to receive a KIT (PCB with set of component to solder) and even pre-assembled and fully tested "3niti alpha simu1".

Note: Latest firmware still doesn't utilize external serial memory - simulator in current state supports only TWO 27-triad memory pages (located inside of the PIC MCU) for ternary data and ternary code, but it's easily fixable in future when we will release a new firmware that could be loaded into the PIC through bootloader serial interface).