There are many forms of computing hardware systems, ever more so these days with TPU (Tensor Processing Units), GPUs, Multi-Core CPUs, Parallela Epiphany cores, FPGAs, Risc-V ISA, Analog Computing, Quantum Bits, Memristors, AI, ML, Deep Neural Nets, ...

thocp.net/biographies/pa… The linked paper above is one older perspective. It was written just as the age of networking was beginning and published two years before the advent of Smalltalk-80 that brought in a new paradigm of Object Oriented Programming were objects communicate via passing of messages.