First, the IBM Personal Computer, The Next Step. . . Tecmar

Byte Magazine, Vol 7, No. 6, June 1982, pg. 299
Byte Magazine, Vol 7, No. 7, July 1982, pg. 71
Byte Magazine, Vol 7, No. 8, August 1982, pg. 263
Byte Magazine, Vol 7, No. 9, September 1982, pg. 39
PC Magazine, Vol 1, No. 3, June-July 1982, Back Cover
PC Magazine, Vol 1, No. 4, August 1982, Back Cover
PC Magazine, Vol 1, No. 5, September 1982, Back Cover
Creative Computing, Vol 8, No. 10, October 1982, pg. 7

Numerous products mentioned including IEEE-488, LabTender,LabMaster,Stepper Motor Controller, BaseBoard, Video VanGogh, etc.