£30 ..offers
The Stealth Serial Port provides a fully compatible serial port for you new Mac. Unlike USB-to-serial adapters, the Stealth Serial Port works with Localtalk (OS9 only), MIDI, any serial printer and virtually any other Mac serial peripheral
Compatible
- Functions just like a standard Mac serial port, including LocalTalk (OS 9 only)
- Hardware based on the same serial chipset found on earlier Power Macs
- Supports externally clocked serial peripherals such as serial printers and MIDI devices
- Standard mini-DIN8 connector
Simple
- Installs in minutes
- Uses internal modem slot
https://web.archive.org/web/20100216212811/http://www.geethree.com/stealth/index.html