ISC Intecolor 8051 Circa 1978

I recently rescued an Intelligent Systems Corp. model 8051 Intecolor terminal/pc, s/n 5013 from the side of a road (there were several printers which first caught my eye, this unit has a wood grained plastic cover which first made me think it was an old window air conditioner as it was face down and covered with other junk). I saw this advertised in the February and December issues of Byte Magazine as a model 8001. The December 76 Byte ad states this is an intelligent terminal that can be upgraded to a personal computer by adding Basic and extra ram (this appears to have been upgraded). I had never seen one of these in person before and didn't realize how massive they are: 17" high by 19 1/2 " wide by 22" deep, weighing at least 50 pounds (although I haven't weighed it). The tube is a 19" color. There are 9 slots inside with a CPU/I/O/Keyboard board (Intel 8080A), memory, additional memory board, prom board (with Basic and others) plus a floppy controller. Ports (DB25) are J1 Modem, J2 Floppy Tape, J3 Keyboard, J4 24 Bit I/O (this port is blank actually),J5 Floppy Disk, J6 USART (port is blank). Unfortunately there was no keyboard or documentation and outside of the Byte ads I don't know anything about this. Does anyone know where I can get a keyboard and documentation for this? Also the power cable is non-standard, per a friend of mine it was used by typewriter manufacturers and is known as a AC Victor cable. Thanks, Marty