The invention relates to a method and a device for sequentially processing a plurality of programs on a hardware processing unit. The sequence order of the plurality of programs is not deterministic, and the programs require individual amounts of process data. A device for sequentially processing such programs comprises means (61) for providing a command, means (62) for determining the required processing data according to the command, means (63) for providing the determined processing data, first buffer (CB) for buffering the provided command, second buffer (DB) for buffering the provided processing data, means (68) for determining and reading a program corresponding to the buffered command, means (BM) for retrieving from the second buffer the processing data that correspond to the command, and means (69) for processing the processing data according to said program. The second buffer (DB) is a ring buffer and the means (BM) for retrieving the processing data comprises means (VPA) for associating virtual buffer read addresses received from the processing unit (69) with physical read addresses.