@ longreach, I could be wrong but I don't think there is such a receiver as the TM-6600 DAPCI.
There is no sign of one on technomate's site, it could be that you are getting confused with the TM-7800 CX2CI which has 6600 channels.
Looking at that site the Technomate ad mentions a 5500 CI Plus, a 5500APCI and a few 8000 series receivers. Nothing like the OP posted.
I thought that Judith (lovely voice on the telephone) and her husband had packed up due to lack of business.