Hoppi is an application for Apple Mac OSX to allow communication
with HP48/49/50-series calculators using the Kermit file transfer
protocol. It supports both USB and RS232 calculator ports.
The application implements a Kermit server and presents a simple
interface to the user allowing the state of the connection to be
controlled and monitored.
Downloads are available from
where you should find versions for PowerPC and Intel Macs. The
PowerPC version requires OSX 10.5 (Leopard), the Intel version
requires OSX 10.7 (Lion) or better -- the latest version having been
tested on OSX 10.10 (Yosemite).
Documentation is available via the Mac application help facility and
in PDF documents included with the downloads. It is also viewable
The latest version (Hoppi 1.3.1) fixes a problem with application
startup on OSX 10.10.3.
5 May 2015