Microchip's new PIC16F87x series of Flash EEPROM microcontrollers offer greater program capacity and more facilities than the familiar PIC16x84 series. The latter, though, will still find a plethora of uses in less-demanding circuits where the greater sophistication of the '87s is not required. There are roles for both families. Consequently, our PIC Toolkit construction project has been upgraded to make it compatible with both the '84 and the '87 devices. The printed circuit board has been redesigned to accept the 18-pin '84s and the 28/40-pin '87s.