The TDS was a transputer application written in occam. The transputer instruction set consisted of 8-bit instructions assembled from opcode and operand nibbles. TPCORE is an implementation of the transputer, including the os-links, that runs in a FPGA. May was lead architect for the transputer. It lacks memory protection, due largely to the lack of an MMU on the transputer. The second-generation "T800" transputer, introduced in 1987, had an extended instruction set. Prentice-Hall published a book on the general principles of the Transputer. Helios was predominantly intended to be used with Transputer systems. He went on to form Inmos and develop the transputer. Around the same time, work was started on an enhanced transputer, the T9000. Other processes running on the transputer would then be given that processing time. Occam was an early process-oriented language developed for the Transputer. T9000 Transputer, a complex superscalar pipelined processor designed to support large-scale multiprocessing. Originally the plan was to make the transputer cost only a few dollars per unit. The prototype of the transputer was called the Simple 42 and was completed in 1982.