[btech] developed Pocket Pico, a modern replica of the Heathkit HK-21 Pocket Packet. Raspberry Pi Pico handles Z80 processor emulation and the modulation-demodulation of Bell 202 audio tones at 1200 baud. The device runs the same software as the HK-21, ensuring compatibility with legacy packet radio software.
- APRS
- AX.25 Level 2
- Built-in Personal Bulletin Board System (BBS), where stations can leave messages
Why it matters
The project’s primary significance lies in enabling legacy packet radio software developed for the HK-21 to run on a Raspberry Pi Pico-based platform without relying on the original hardware. Z80 emulation and Bell 202 processing support allow a different hardware foundation to be used while preserving the classic software structure. Support for APRS and AX.25 Level 2 makes this compatibility more than just a historical reproduction by linking it to packet radio capabilities. The built-in BBS function also preserves the communication model in which stations can leave messages as part of the device. However, the way it connects to existing radio hardware and the practical limits of its compatibility are left unspecified in the information provided.
Background
Pocket is not a new name in the FikirPilot archive: we published a news article mentioning this name in the last 90 days; that article was dated September 12, 2026.