The transputer Tmem receives instructions for the device and breaks them down into programs for parallel processing by the transputers T1 to T16.

These transputers will normally need to communicate, and the necessary connections are provided by a switch network (12), under the control of the transputer Tmem.

These are divided into a set of working transputers T1 to T16, and a set of interface transputers Tx, Ty, Tz, Tt providing input/output facilities for the device, both sets being under the control of a transputer Tmem.