Mike Granby wrote:

: Yep. It's an expansion board that mounts in the radio. It's not voltage
: specific, as it gets its power from the main board so doesn't care if
: it's in a 14V or 28V unit. You see them on eBay occasionally, but they
: are not too common.

And they seem to go for upwards of $500. It's probably cheaper to buy
a KX-155 with a GS board in it, and unload the old one on e-bay. Easier, too.
--
Aaron C.