I'm retrofitting a KMB-1, and it contains a tape emulator from Accurate Machine Tool. I have no need for it, so if anyone is interested in it I will let it go at a reasonable price. It also comes with the cable to connect it to your PC. I don't know much about it, but I do know it will work on both the B and BX, and installs in a couple of minutes. The software needed is available from http://www.amtsinc.com/ .
The list price there is $400.00
Pm me if interested, Thanks.