BASIC Stamp 2
24-pin PBASIC programmable microprocessor
4K instructions per second. 2K EEPROM, allowing about 500 program lines. 32 bytes RAM. 18 I/O pins: 16 standard, 2 serial only. Serial programming interface. 24 pin DIP module. (For a more powerful processor and more robut programming language, see the BasicX microcontroller instead.)

