"SIP-T" was an assembler for TOSBAC-3100, developed by Toshiba in 1961. It was developed by referring to the assembler "SIP" for NEAC2203 and HITAC301, which Japanese Electronic Industry Development Association (JEIDA) had developed by way of a commission to Professor Moriguchi of the University of Tokyo. The development came about in response to the need to implement a function for securing the computing speed of execution in the assembler by optimizing arrangement of the instruction words for TOSBAC-3100, which used a magnetic drum as the main storage.
In 1962, Toshiba commissioned Associate Professor Niizawa of the Computer Section, Waseda University, to develop a new assembler by referring to the assembler "SOAP" for IBM650, as the software for TOSBAC-3100. The newly developed assembler was named "SOAP."
Also in 1962, Toshiba commissioned Professor Nakajima and Professor Iwasaki of the Computer Section, Waseda University, to develop an ALGOL compiler "WALT."