I am selling my 100% working and very uncommon Apple /// (3) Serial I/O card.
This card is very unique as it uses a push button to switch between standard and null modem serial cable with the push of a button depending on what kind of cable you have.
Card, with box and custom foam inserts from Apple. This is a card almost never seen so for serious Apple collectors only.
I have been selling on for over 23+ years excelling in customer response.