BASIC Commands for the BASIC Stamp and BS1-IC (January 28, 1995)

BRANCHING       
     IF...THEN   Compare and conditionally branch.
     BRANCH      Branch to address specified by offset.
     GOTO        Branch to address.
     GOSUB       Branch to subroutine at address. Up to 16 GOSUBs are allowed.
     RETURN      Return from subroutine.

LOOPING
     FOR...NEXT  Establish a FOR-NEXT loop.

NUMERICS        
     {LET}       Perform variable manipulation, such as A=5, B=A+2, etc. Possible
                 operations are add, subtract, multiply, divide, max. limit, min.
                 limit, and logical operations AND, OR, XOR, AND NOT, OR NOT, and
                 XOR NOT.
     LOOKUP      Lookup data specified by offset and store in variable. This
                 instruction provides a means to make a lookup table.
     LOOKDOWN    Find targetŐs match number (0-N) and store in variable.
     RANDOM      Generate a pseudo-random number.

DIGITAL I/O
     OUTPUT      Make pin an output.
     LOW         Make pin output low.
     HIGH        Make pin output high.
     TOGGLE      Make pin an output and toggle state.
     PULSOUT     Output a timed pulse by inverting a pin for some time.
     INPUT       Make pin an input
     PULSIN      Measure an input pulse.
     REVERSE     If pin is an output, make it an input. If pin is an input, make it
                 an output.
     BUTTON      Debounce button, perform auto-repeat, and branch to address if
                 button is in target state.

SERIAL I/O      
     SERIN       Serial input with optional qualifiers and variables for storage of
                 received data. If qualifiers are given, then the instruction will
                 wait until they are received before filling variables or continuing
                 to the next instruction. Baud rates of 300, 600, 1200, and 2400 are
                 possible. Data received must be with no parity, 8 data bits, and 1
                 stop bit.
     SEROUT      Send data serially. Data is sent at 300, 600, 1200, or 2400 baud,
                 with no parity, 8 data bits, and 1 stop bit.

ANALOG I/O
     PWM         Output PWM, then return pin to input. This can be used to output
                 analog voltages (0-5V) using a capacitor and resistor.
     POT         Read a 5-50K potentiometer and scale result. 

SOUND   
     SOUND       Play notes. Note 0 is silence, notes 1-127 are ascending tones, and
                 notes 128-255 are white noises.

EEPROM ACCESS   
     EEPROM      Store data in EEPROM before downloading BASIC program.
     READ        Read EEPROM byte into variable.
     WRITE       Write byte into EEPROM.

TIME
     PAUSE       Pause execution for 0-65536 milliseconds.

POWER CONTROL   
     NAP         Nap for a short period. Power consumption is reduced.
     SLEEP       Sleep for 1-65535 seconds. Power consumption is reduced to
                 approximately 20 uA.
     END         Sleep until the power cycles or the PC connects. Power consumption
                 is reduced to approximately 20 uA.

DEBUGGING
     DEBUG       Send variables to PC for viewing.