Looks like they are DIY kits.
I can't believe they still support these.
They still produce and sell the PK-232 series !
Yes, you can purchase the DIY kit (aka Heathkit / skilled radio amateur) OR have Timewave's bench technicians add the parts and checkout.
PK-232 Upgrade Guide
Timewave/AEA/Heath Upgrade options
When you look at DRSI, Kantronics, MFJ, Timewave/AEA/Heath, and PacComm --
Timewave is the BEST in support (North America) for the hardware based TNCs and multi-mode controllers.
IF Gwyn Reedy, W1BEL(sk) was still running PacComm (passed away December 2006) and active in TAPR --
I think he would be supporting the earlier products as well (or better) than Timewave.
We keep moving forward, opening new doors, and doing new things, because we're curious and curiosity keeps leading us down new paths. -- Walt Disney