Could do graphic plotting via the Tektronix Plot 10 library. The EDA software was ported to Multics at the University of Grenoble Computing Center, CICG by Bernard Bretagnolle and Bernard Rapacchi. Bob Daley liked it, revised it to work with 6-bit files, and named the result EDL . EIS Extended Instruction Set. A suite of instructions added to the 645 set when the 6180 was introduced.
Descriptors contain an address, pointer-register flag, and indirect modifier.
The EIS processor has its own set of address registers. 4 for moving. 3 for numeric move, compare, and edit. 5 for bit strings. 2 for binary to decimal and back.