The present invention discloses a computer-readable storage medium having computer-readable code embodied on the computer-readable storage medium, the computer-readable code including: program code for delivering, in response to a CPU request, from a host-system processor of a host system, for a command code, an SWI that is different than the command code. Preferably, the computer-readable code further includes: program code for selecting between providing the command code and providing the SWI based on an availability of the command code. Preferably, the computer-readable code further includes: program code for distinguishing between a command-code read-request and a data read-request according to a built-in command-codes table, wherein the command-code read-request and the data read-request are different. Preferably, the computer-readable code further includes: program code that uses SWI machine code to respond to the host-system processor, when the command code is a part of a missing-code segment, without causing latency.