The devices use an ATmega644p on a compact 0.7" x 2.0" circuit board that can be plugged into a standard 40-pin 600mil socket. See the Technical Reference for more details. Version 2.8 or greater is needed for the ZBasic Installer. The ZX-24nu and ZX-24pu have the following integrated features:
- 28 I/O pins (32 for ZX-24nu) in a socketable, breadboard-friendly format.
- USB mini-B receptacle for downloading application code and for host PC serial communications using industry-standard FTDI USB UART. A suitable cable is available as an option.
- Program memory of 64K bytes in SPI EEPROM for ZX-24pu or 60K bytes Flash for ZX-24nu.
- 3.5K bytes of user RAM (up to 4K for ZX-24nu) and 2016 bytes of user EEPROM.
- Transmit and receive monitor LEDs for host communications.
- Self-powered mode from USB port eliminates requirement for external power.
- Red power monitor LED.
- 5V power regulator with 600mA capacity for stand-alone use.
- Red and green active low port I/O port LED monitors (and yellow active high for ZX-24nu only).
- I2C and SPI bus support using breadboard-friendly I/O pins.