A digital data processor comprising a stack storage having a plurality of locations classified into two or more banks, and a stack pointer circuit pointing to one or more stack banks of the stack storage. The stack pointer circuit operates in response to decoding signals from an instruction decoder which decodes a current instruction to determine whether a one-word or a multi-word stack operation is desired.
A computer (12) having multiple data paths (38a-d) connecting to other devices, which may be similar computers. A register (40d) is provided that has bits (110) programmatically settable to address each of the data paths such that the computer can communicate via multiple of the data paths based on which bits are concurrently set in the register. The bits respectively represent instances of the other devices as source devices that the computer can read data from and instances of the other devices as destination devices that the computer can write data to. A single address in the register can represent both a source device and a destination device for data communicated by the computer. Optionally, multiple of the computers can be connected in series (termed a pipeline) or to form an array (10).
