Here's the instruction set for PicBASIC Pro, as lifted from the MEL web
site at:

http://www.melabs.com/mel/pbp.htm

Note the page boundary handling, If..Then..Else..Endif and Interrupts.


BASIC Stamp I & II library
      Automatic page boundary handling past 2K
      Direct and library routine access to any pin or register
      Real If..Then..Else..Endif
      Hierarchal expression handling
      Interrupts in Basic and assembler
      Built-in LCD support
      Oscillator support from 3.58Mhz to 20Mhz
      More variable space (processor dependent)
      MPASM / ICE compatibilty

Variable types:

      BIT
      BYTE
      WORD
      BIT ARRAYS
      BYTE ARRAYS
      WORD ARRAYS

PicBasic Pro Instruction Set:

      @ - Insert one line of assembly language code.
      ASM..ENDASM - Insert assembly language code section.
      BRANCH - Computed GOTO (equiv. to ON..GOTO).
      BRANCHL - BRANCH out of page (long BRANCH).
      BUTTON - Debounce and auto-repeat input on specified pin.
      CALL - Call assembly language subroutine at specified label.
      CLEAR - Zero all variables.
      COUNT - Count number of pulses on a pin.
      DATA - Define initial contents of on-chip EEPROM.
      DISABLE - Disable ON INTERRUPT processing.
      DTMFOUT - Produce touch-tones on a pin.
      EEPROM - Define initial contents of on-chip EEPROM.
      ENABLE - Enable ON INTERRUPT processing.
      END - Stop execution and enter low power mode.
      FOR..NEXT - Repeatedly execute statement(s).
      FREQOUT - Produce up to 2 frequencies on a pin.
      GOSUB - Call BASIC subroutine at specified label.
      GOTO - Continue execution at specified label.
      HIGH - Make pin output high.
      I2CREAD - Read bytes from I2C device.
      I2CWRITE - Write bytes to I2C device.
      IF..THEN..ELSE..ENDIF - Conditionally execute on specified
condition.
      INPUT - Make pin an input.
      {LET} - Assign result of an expression to a variable.
      LCDOUT - Display characters on LCD.
      LOOKDOWN - Search constant table for value.
      LOOKDOWN2 - Search constant / variable table for value.
      LOOKUP - Fetch constant value from table.
      LOOKUP2 - Fetch constant / variable value from table.
      LOW - Make pin output low.
      NAP - Power down processor for short period of time.
      ON INTERRUPT - Execute subroutine on an interrupt.
      OUTPUT - Make pin an output.
      PAUSE - Delay (1mSec resolution).
      PAUSEUS - Delay (1uSec resolution).
      PEEK - Read byte from register.
      POKE - Write byte to register.
      POT - Read potentiometer on specified pin.
      PULSIN - Measure pulse width.
      PULSOUT - Generate pulse.
      PWM - Output pulse width modulated pulse train to pin.
      RANDOM - Generate pseudo-random number.
      RCTIME - Measure pulse width.
      READ - Read byte from on-chip EEPROM.
      RESUME - Continue execution after interrupt handling.
      RETURN - Continue execution at statement following last executed
GOSUB.
      REVERSE - Make output pin an input or an input pin an output.
      SERIN - Asynchronous serial input (N81).
      SEROUT - Asynchronous serial output (N81).
      SHIFTIN - Synchronous serial input.
      SHIFTOUT - Synchronous serial output.
      SLEEP - Power down processor for a period of time.
      STOP - Stop program execution.
      SOUND - Generate tone or white-noise on specified pin.
      TOGGLE - Make pin output and toggle state.
      WHILE..WEND - Execute code while condition is true.
      WRITE - Write byte to on-chip EEPROM.

Functions / Operators:

      ABS - Absolute value
      COS - Cosine
      DCD - 2n decode
      DIG - Return digit
      MAX - Maximum
      MIN - Minimum
      NCD - Encode
      REV - Reverse bits
      SIN - Sine
      SQR - Square root
      + - / // * ** */ << >> & | ^ ~ && || ^^ &/ |/ ^/

The PicBasic Pro Compiler does not have the same level of compatibility
with the BASIC Stamp I that the PicBasic Compiler
enjoys. The PicBasic Pro Compiler is more of a "real" BASIC.